commit ce4d9a1ea35ac5429e822c4106cb2859d5c71f3e upstream.
Patch series "Fix kmemleak crashes when scanning CMA regions", v2.
When trying to boot a device with an ARM64 kernel with the following
config options enabled:
CONFIG_DEBUG_PAGEALLOC=y
CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y
CONFIG_DEBUG_KMEMLEAK=y
a crash is encountered when kmemleak starts to scan the list of gray
or allocated objects that it maintains. Upon closer inspection, it was
observed that these page-faults always occurred when kmemleak attempted
to scan a CMA region.
At the moment, kmemleak is made aware of CMA regions that are specified
through the devicetree to be dynamically allocated within a range of
addresses. However, kmemleak should not need to scan CMA regions or any
reserved memory region, as those regions can be used for DMA transfers
between drivers and peripherals, and thus wouldn't contain anything
useful for kmemleak.
Additionally, since CMA regions are unmapped from the kernel's address
space when they are freed to the buddy allocator at boot when
CONFIG_DEBUG_PAGEALLOC is enabled, kmemleak shouldn't attempt to access
those memory regions, as that will trigger a crash. Thus, kmemleak
should ignore all dynamically allocated reserved memory regions.
This patch (of 1):
Currently, kmemleak ignores dynamically allocated reserved memory regions
that don't have a kernel mapping. However, regions that do retain a
kernel mapping (e.g. CMA regions) do get scanned by kmemleak.
This is not ideal for two reasons:
1 kmemleak works by scanning memory regions for pointers to allocated
objects to determine if those objects have been leaked or not.
However, reserved memory regions can be used between drivers and
peripherals for DMA transfers, and thus, would not contain pointers to
allocated objects, making it unnecessary for kmemleak to scan these
reserved memory regions.
2 When CONFIG_DEBUG_PAGEALLOC is enabled, along with kmemleak, the
CMA reserved memory regions are unmapped from the kernel's address
space when they are freed to buddy at boot. These CMA reserved regions
are still tracked by kmemleak, however, and when kmemleak attempts to
scan them, a crash will happen, as accessing the CMA region will result
in a page-fault, since the regions are unmapped.
Thus, use kmemleak_ignore_phys() for all dynamically allocated reserved
memory regions, instead of those that do not have a kernel mapping
associated with them.
Link: https://lkml.kernel.org/r/20230208232001.2052777-1-isaacmanjarres@google.com
Link: https://lkml.kernel.org/r/20230208232001.2052777-2-isaacmanjarres@google.com
Fixes: a7259df76702 ("memblock: make memblock_find_in_range method private")
Signed-off-by: Isaac J. Manjarres <isaacmanjarres(a)google.com>
Acked-by: Mike Rapoport (IBM) <rppt(a)kernel.org>
Acked-by: Catalin Marinas <catalin.marinas(a)arm.com>
Cc: Frank Rowand <frowand.list(a)gmail.com>
Cc: Kirill A. Shutemov <kirill.shtuemov(a)linux.intel.com>
Cc: Nick Kossifidis <mick(a)ics.forth.gr>
Cc: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com>
Cc: Rob Herring <robh(a)kernel.org>
Cc: Russell King (Oracle) <rmk+kernel(a)armlinux.org.uk>
Cc: Saravana Kannan <saravanak(a)google.com>
Cc: <stable(a)vger.kernel.org> [5.15+]
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
drivers/of/of_reserved_mem.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 9da8835ba5a5..9e949ddcb146 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -47,9 +47,10 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
err = memblock_mark_nomap(base, size);
if (err)
memblock_free(base, size);
- kmemleak_ignore_phys(base);
}
+ kmemleak_ignore_phys(base);
+
return err;
}
--
2.39.2.637.g21b0678d19-goog
The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
Possible dependencies:
99b9402a36f0 ("nilfs2: fix underflow in second superblock position calculations")
4fcd69798d7f ("nilfs2: use bdev_nr_bytes instead of open coding it")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 99b9402a36f0799f25feee4465bfa4b8dfa74b4d Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Date: Wed, 15 Feb 2023 07:40:43 +0900
Subject: [PATCH] nilfs2: fix underflow in second superblock position
calculations
Macro NILFS_SB2_OFFSET_BYTES, which computes the position of the second
superblock, underflows when the argument device size is less than 4096
bytes. Therefore, when using this macro, it is necessary to check in
advance that the device size is not less than a lower limit, or at least
that underflow does not occur.
The current nilfs2 implementation lacks this check, causing out-of-bound
block access when mounting devices smaller than 4096 bytes:
I/O error, dev loop0, sector 36028797018963960 op 0x0:(READ) flags 0x0
phys_seg 1 prio class 2
NILFS (loop0): unable to read secondary superblock (blocksize = 1024)
In addition, when trying to resize the filesystem to a size below 4096
bytes, this underflow occurs in nilfs_resize_fs(), passing a huge number
of segments to nilfs_sufile_resize(), corrupting parameters such as the
number of segments in superblocks. This causes excessive loop iterations
in nilfs_sufile_resize() during a subsequent resize ioctl, causing
semaphore ns_segctor_sem to block for a long time and hang the writer
thread:
INFO: task segctord:5067 blocked for more than 143 seconds.
Not tainted 6.2.0-rc8-syzkaller-00015-gf6feea56f66d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:segctord state:D stack:23456 pid:5067 ppid:2
flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5293 [inline]
__schedule+0x1409/0x43f0 kernel/sched/core.c:6606
schedule+0xc3/0x190 kernel/sched/core.c:6682
rwsem_down_write_slowpath+0xfcf/0x14a0 kernel/locking/rwsem.c:1190
nilfs_transaction_lock+0x25c/0x4f0 fs/nilfs2/segment.c:357
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2486 [inline]
nilfs_segctor_thread+0x52f/0x1140 fs/nilfs2/segment.c:2570
kthread+0x270/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
...
Call Trace:
<TASK>
folio_mark_accessed+0x51c/0xf00 mm/swap.c:515
__nilfs_get_page_block fs/nilfs2/page.c:42 [inline]
nilfs_grab_buffer+0x3d3/0x540 fs/nilfs2/page.c:61
nilfs_mdt_submit_block+0xd7/0x8f0 fs/nilfs2/mdt.c:121
nilfs_mdt_read_block+0xeb/0x430 fs/nilfs2/mdt.c:176
nilfs_mdt_get_block+0x12d/0xbb0 fs/nilfs2/mdt.c:251
nilfs_sufile_get_segment_usage_block fs/nilfs2/sufile.c:92 [inline]
nilfs_sufile_truncate_range fs/nilfs2/sufile.c:679 [inline]
nilfs_sufile_resize+0x7a3/0x12b0 fs/nilfs2/sufile.c:777
nilfs_resize_fs+0x20c/0xed0 fs/nilfs2/super.c:422
nilfs_ioctl_resize fs/nilfs2/ioctl.c:1033 [inline]
nilfs_ioctl+0x137c/0x2440 fs/nilfs2/ioctl.c:1301
...
This fixes these issues by inserting appropriate minimum device size
checks or anti-underflow checks, depending on where the macro is used.
Link: https://lkml.kernel.org/r/0000000000004e1dfa05f4a48e6b@google.com
Link: https://lkml.kernel.org/r/20230214224043.24141-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Reported-by: <syzbot+f0c4082ce5ebebdac63b(a)syzkaller.appspotmail.com>
Tested-by: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 87e1004b606d..b4041d0566a9 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -1114,7 +1114,14 @@ static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
minseg = range[0] + segbytes - 1;
do_div(minseg, segbytes);
+
+ if (range[1] < 4096)
+ goto out;
+
maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
+ if (maxseg < segbytes)
+ goto out;
+
do_div(maxseg, segbytes);
maxseg--;
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 6edb6e0dd61f..1422b8ba24ed 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -408,6 +408,15 @@ int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
if (newsize > devsize)
goto out;
+ /*
+ * Prevent underflow in second superblock position calculation.
+ * The exact minimum size check is done in nilfs_sufile_resize().
+ */
+ if (newsize < 4096) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
/*
* Write lock is required to protect some functions depending
* on the number of segments, the number of reserved segments,
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 2064e6473d30..3a4c9c150cbf 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -544,9 +544,15 @@ static int nilfs_load_super_block(struct the_nilfs *nilfs,
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
struct buffer_head **sbh = nilfs->ns_sbh;
- u64 sb2off = NILFS_SB2_OFFSET_BYTES(bdev_nr_bytes(nilfs->ns_bdev));
+ u64 sb2off, devsize = bdev_nr_bytes(nilfs->ns_bdev);
int valid[2], swp = 0;
+ if (devsize < NILFS_SEG_MIN_BLOCKS * NILFS_MIN_BLOCK_SIZE + 4096) {
+ nilfs_err(sb, "device size too small");
+ return -EINVAL;
+ }
+ sb2off = NILFS_SB2_OFFSET_BYTES(devsize);
+
sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize,
&sbh[0]);
sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]);
The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
Possible dependencies:
99b9402a36f0 ("nilfs2: fix underflow in second superblock position calculations")
4fcd69798d7f ("nilfs2: use bdev_nr_bytes instead of open coding it")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 99b9402a36f0799f25feee4465bfa4b8dfa74b4d Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Date: Wed, 15 Feb 2023 07:40:43 +0900
Subject: [PATCH] nilfs2: fix underflow in second superblock position
calculations
Macro NILFS_SB2_OFFSET_BYTES, which computes the position of the second
superblock, underflows when the argument device size is less than 4096
bytes. Therefore, when using this macro, it is necessary to check in
advance that the device size is not less than a lower limit, or at least
that underflow does not occur.
The current nilfs2 implementation lacks this check, causing out-of-bound
block access when mounting devices smaller than 4096 bytes:
I/O error, dev loop0, sector 36028797018963960 op 0x0:(READ) flags 0x0
phys_seg 1 prio class 2
NILFS (loop0): unable to read secondary superblock (blocksize = 1024)
In addition, when trying to resize the filesystem to a size below 4096
bytes, this underflow occurs in nilfs_resize_fs(), passing a huge number
of segments to nilfs_sufile_resize(), corrupting parameters such as the
number of segments in superblocks. This causes excessive loop iterations
in nilfs_sufile_resize() during a subsequent resize ioctl, causing
semaphore ns_segctor_sem to block for a long time and hang the writer
thread:
INFO: task segctord:5067 blocked for more than 143 seconds.
Not tainted 6.2.0-rc8-syzkaller-00015-gf6feea56f66d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:segctord state:D stack:23456 pid:5067 ppid:2
flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5293 [inline]
__schedule+0x1409/0x43f0 kernel/sched/core.c:6606
schedule+0xc3/0x190 kernel/sched/core.c:6682
rwsem_down_write_slowpath+0xfcf/0x14a0 kernel/locking/rwsem.c:1190
nilfs_transaction_lock+0x25c/0x4f0 fs/nilfs2/segment.c:357
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2486 [inline]
nilfs_segctor_thread+0x52f/0x1140 fs/nilfs2/segment.c:2570
kthread+0x270/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
...
Call Trace:
<TASK>
folio_mark_accessed+0x51c/0xf00 mm/swap.c:515
__nilfs_get_page_block fs/nilfs2/page.c:42 [inline]
nilfs_grab_buffer+0x3d3/0x540 fs/nilfs2/page.c:61
nilfs_mdt_submit_block+0xd7/0x8f0 fs/nilfs2/mdt.c:121
nilfs_mdt_read_block+0xeb/0x430 fs/nilfs2/mdt.c:176
nilfs_mdt_get_block+0x12d/0xbb0 fs/nilfs2/mdt.c:251
nilfs_sufile_get_segment_usage_block fs/nilfs2/sufile.c:92 [inline]
nilfs_sufile_truncate_range fs/nilfs2/sufile.c:679 [inline]
nilfs_sufile_resize+0x7a3/0x12b0 fs/nilfs2/sufile.c:777
nilfs_resize_fs+0x20c/0xed0 fs/nilfs2/super.c:422
nilfs_ioctl_resize fs/nilfs2/ioctl.c:1033 [inline]
nilfs_ioctl+0x137c/0x2440 fs/nilfs2/ioctl.c:1301
...
This fixes these issues by inserting appropriate minimum device size
checks or anti-underflow checks, depending on where the macro is used.
Link: https://lkml.kernel.org/r/0000000000004e1dfa05f4a48e6b@google.com
Link: https://lkml.kernel.org/r/20230214224043.24141-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Reported-by: <syzbot+f0c4082ce5ebebdac63b(a)syzkaller.appspotmail.com>
Tested-by: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 87e1004b606d..b4041d0566a9 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -1114,7 +1114,14 @@ static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
minseg = range[0] + segbytes - 1;
do_div(minseg, segbytes);
+
+ if (range[1] < 4096)
+ goto out;
+
maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
+ if (maxseg < segbytes)
+ goto out;
+
do_div(maxseg, segbytes);
maxseg--;
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 6edb6e0dd61f..1422b8ba24ed 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -408,6 +408,15 @@ int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
if (newsize > devsize)
goto out;
+ /*
+ * Prevent underflow in second superblock position calculation.
+ * The exact minimum size check is done in nilfs_sufile_resize().
+ */
+ if (newsize < 4096) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
/*
* Write lock is required to protect some functions depending
* on the number of segments, the number of reserved segments,
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 2064e6473d30..3a4c9c150cbf 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -544,9 +544,15 @@ static int nilfs_load_super_block(struct the_nilfs *nilfs,
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
struct buffer_head **sbh = nilfs->ns_sbh;
- u64 sb2off = NILFS_SB2_OFFSET_BYTES(bdev_nr_bytes(nilfs->ns_bdev));
+ u64 sb2off, devsize = bdev_nr_bytes(nilfs->ns_bdev);
int valid[2], swp = 0;
+ if (devsize < NILFS_SEG_MIN_BLOCKS * NILFS_MIN_BLOCK_SIZE + 4096) {
+ nilfs_err(sb, "device size too small");
+ return -EINVAL;
+ }
+ sb2off = NILFS_SB2_OFFSET_BYTES(devsize);
+
sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize,
&sbh[0]);
sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]);
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
Possible dependencies:
99b9402a36f0 ("nilfs2: fix underflow in second superblock position calculations")
4fcd69798d7f ("nilfs2: use bdev_nr_bytes instead of open coding it")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 99b9402a36f0799f25feee4465bfa4b8dfa74b4d Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Date: Wed, 15 Feb 2023 07:40:43 +0900
Subject: [PATCH] nilfs2: fix underflow in second superblock position
calculations
Macro NILFS_SB2_OFFSET_BYTES, which computes the position of the second
superblock, underflows when the argument device size is less than 4096
bytes. Therefore, when using this macro, it is necessary to check in
advance that the device size is not less than a lower limit, or at least
that underflow does not occur.
The current nilfs2 implementation lacks this check, causing out-of-bound
block access when mounting devices smaller than 4096 bytes:
I/O error, dev loop0, sector 36028797018963960 op 0x0:(READ) flags 0x0
phys_seg 1 prio class 2
NILFS (loop0): unable to read secondary superblock (blocksize = 1024)
In addition, when trying to resize the filesystem to a size below 4096
bytes, this underflow occurs in nilfs_resize_fs(), passing a huge number
of segments to nilfs_sufile_resize(), corrupting parameters such as the
number of segments in superblocks. This causes excessive loop iterations
in nilfs_sufile_resize() during a subsequent resize ioctl, causing
semaphore ns_segctor_sem to block for a long time and hang the writer
thread:
INFO: task segctord:5067 blocked for more than 143 seconds.
Not tainted 6.2.0-rc8-syzkaller-00015-gf6feea56f66d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:segctord state:D stack:23456 pid:5067 ppid:2
flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5293 [inline]
__schedule+0x1409/0x43f0 kernel/sched/core.c:6606
schedule+0xc3/0x190 kernel/sched/core.c:6682
rwsem_down_write_slowpath+0xfcf/0x14a0 kernel/locking/rwsem.c:1190
nilfs_transaction_lock+0x25c/0x4f0 fs/nilfs2/segment.c:357
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2486 [inline]
nilfs_segctor_thread+0x52f/0x1140 fs/nilfs2/segment.c:2570
kthread+0x270/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
...
Call Trace:
<TASK>
folio_mark_accessed+0x51c/0xf00 mm/swap.c:515
__nilfs_get_page_block fs/nilfs2/page.c:42 [inline]
nilfs_grab_buffer+0x3d3/0x540 fs/nilfs2/page.c:61
nilfs_mdt_submit_block+0xd7/0x8f0 fs/nilfs2/mdt.c:121
nilfs_mdt_read_block+0xeb/0x430 fs/nilfs2/mdt.c:176
nilfs_mdt_get_block+0x12d/0xbb0 fs/nilfs2/mdt.c:251
nilfs_sufile_get_segment_usage_block fs/nilfs2/sufile.c:92 [inline]
nilfs_sufile_truncate_range fs/nilfs2/sufile.c:679 [inline]
nilfs_sufile_resize+0x7a3/0x12b0 fs/nilfs2/sufile.c:777
nilfs_resize_fs+0x20c/0xed0 fs/nilfs2/super.c:422
nilfs_ioctl_resize fs/nilfs2/ioctl.c:1033 [inline]
nilfs_ioctl+0x137c/0x2440 fs/nilfs2/ioctl.c:1301
...
This fixes these issues by inserting appropriate minimum device size
checks or anti-underflow checks, depending on where the macro is used.
Link: https://lkml.kernel.org/r/0000000000004e1dfa05f4a48e6b@google.com
Link: https://lkml.kernel.org/r/20230214224043.24141-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Reported-by: <syzbot+f0c4082ce5ebebdac63b(a)syzkaller.appspotmail.com>
Tested-by: Ryusuke Konishi <konishi.ryusuke(a)gmail.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 87e1004b606d..b4041d0566a9 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -1114,7 +1114,14 @@ static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
minseg = range[0] + segbytes - 1;
do_div(minseg, segbytes);
+
+ if (range[1] < 4096)
+ goto out;
+
maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
+ if (maxseg < segbytes)
+ goto out;
+
do_div(maxseg, segbytes);
maxseg--;
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 6edb6e0dd61f..1422b8ba24ed 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -408,6 +408,15 @@ int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
if (newsize > devsize)
goto out;
+ /*
+ * Prevent underflow in second superblock position calculation.
+ * The exact minimum size check is done in nilfs_sufile_resize().
+ */
+ if (newsize < 4096) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
/*
* Write lock is required to protect some functions depending
* on the number of segments, the number of reserved segments,
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 2064e6473d30..3a4c9c150cbf 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -544,9 +544,15 @@ static int nilfs_load_super_block(struct the_nilfs *nilfs,
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
struct buffer_head **sbh = nilfs->ns_sbh;
- u64 sb2off = NILFS_SB2_OFFSET_BYTES(bdev_nr_bytes(nilfs->ns_bdev));
+ u64 sb2off, devsize = bdev_nr_bytes(nilfs->ns_bdev);
int valid[2], swp = 0;
+ if (devsize < NILFS_SEG_MIN_BLOCKS * NILFS_MIN_BLOCK_SIZE + 4096) {
+ nilfs_err(sb, "device size too small");
+ return -EINVAL;
+ }
+ sb2off = NILFS_SB2_OFFSET_BYTES(devsize);
+
sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize,
&sbh[0]);
sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]);
The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
Possible dependencies:
cf4c9d2ac1e4 ("mmc: mmc_spi: fix error handling in mmc_spi_probe()")
1ae51603528c ("mmc: mmc_spi: Indentation fixes")
5716fb9bd9c6 ("mmc: spi: Convert to use GPIO descriptors")
14cd18a89337 ("ARM: ep93xx: simone: let the mmc_spi driver handle the card detect")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From cf4c9d2ac1e42c7d18b921bec39486896645b714 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang(a)huawei.com>
Date: Tue, 31 Jan 2023 09:38:35 +0800
Subject: [PATCH] mmc: mmc_spi: fix error handling in mmc_spi_probe()
If mmc_add_host() fails, it doesn't need to call mmc_remove_host(),
or it will cause null-ptr-deref, because of deleting a not added
device in mmc_remove_host().
To fix this, goto label 'fail_glue_init', if mmc_add_host() fails,
and change the label 'fail_add_host' to 'fail_gpiod_request'.
Fixes: 15a0580ced08 ("mmc_spi host driver")
Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230131013835.3564011-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson(a)linaro.org>
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 106dd204b1a7..cc333ad67cac 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1437,7 +1437,7 @@ static int mmc_spi_probe(struct spi_device *spi)
status = mmc_add_host(mmc);
if (status != 0)
- goto fail_add_host;
+ goto fail_glue_init;
/*
* Index 0 is card detect
@@ -1445,7 +1445,7 @@ static int mmc_spi_probe(struct spi_device *spi)
*/
status = mmc_gpiod_request_cd(mmc, NULL, 0, false, 1000);
if (status == -EPROBE_DEFER)
- goto fail_add_host;
+ goto fail_gpiod_request;
if (!status) {
/*
* The platform has a CD GPIO signal that may support
@@ -1460,7 +1460,7 @@ static int mmc_spi_probe(struct spi_device *spi)
/* Index 1 is write protect/read only */
status = mmc_gpiod_request_ro(mmc, NULL, 1, 0);
if (status == -EPROBE_DEFER)
- goto fail_add_host;
+ goto fail_gpiod_request;
if (!status)
has_ro = true;
@@ -1474,7 +1474,7 @@ static int mmc_spi_probe(struct spi_device *spi)
? ", cd polling" : "");
return 0;
-fail_add_host:
+fail_gpiod_request:
mmc_remove_host(mmc);
fail_glue_init:
mmc_spi_dma_free(host);
The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
Possible dependencies:
cf4c9d2ac1e4 ("mmc: mmc_spi: fix error handling in mmc_spi_probe()")
1ae51603528c ("mmc: mmc_spi: Indentation fixes")
5716fb9bd9c6 ("mmc: spi: Convert to use GPIO descriptors")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From cf4c9d2ac1e42c7d18b921bec39486896645b714 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang(a)huawei.com>
Date: Tue, 31 Jan 2023 09:38:35 +0800
Subject: [PATCH] mmc: mmc_spi: fix error handling in mmc_spi_probe()
If mmc_add_host() fails, it doesn't need to call mmc_remove_host(),
or it will cause null-ptr-deref, because of deleting a not added
device in mmc_remove_host().
To fix this, goto label 'fail_glue_init', if mmc_add_host() fails,
and change the label 'fail_add_host' to 'fail_gpiod_request'.
Fixes: 15a0580ced08 ("mmc_spi host driver")
Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230131013835.3564011-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson(a)linaro.org>
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 106dd204b1a7..cc333ad67cac 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1437,7 +1437,7 @@ static int mmc_spi_probe(struct spi_device *spi)
status = mmc_add_host(mmc);
if (status != 0)
- goto fail_add_host;
+ goto fail_glue_init;
/*
* Index 0 is card detect
@@ -1445,7 +1445,7 @@ static int mmc_spi_probe(struct spi_device *spi)
*/
status = mmc_gpiod_request_cd(mmc, NULL, 0, false, 1000);
if (status == -EPROBE_DEFER)
- goto fail_add_host;
+ goto fail_gpiod_request;
if (!status) {
/*
* The platform has a CD GPIO signal that may support
@@ -1460,7 +1460,7 @@ static int mmc_spi_probe(struct spi_device *spi)
/* Index 1 is write protect/read only */
status = mmc_gpiod_request_ro(mmc, NULL, 1, 0);
if (status == -EPROBE_DEFER)
- goto fail_add_host;
+ goto fail_gpiod_request;
if (!status)
has_ro = true;
@@ -1474,7 +1474,7 @@ static int mmc_spi_probe(struct spi_device *spi)
? ", cd polling" : "");
return 0;
-fail_add_host:
+fail_gpiod_request:
mmc_remove_host(mmc);
fail_glue_init:
mmc_spi_dma_free(host);