This is a note to let you know that I've just added the patch titled

platform/x86: wmi: fix off-by-one write in wmi_dev_probe()

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: platform-x86-wmi-fix-off-by-one-write-in-wmi_dev_probe.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 6e1d8ea90932f77843730ada0bfea63093b7212a Mon Sep 17 00:00:00 2001

From: Andrey Ryabinin aryabinin@virtuozzo.com Date: Wed, 14 Feb 2018 14:55:24 +0300 Subject: platform/x86: wmi: fix off-by-one write in wmi_dev_probe()

From: Andrey Ryabinin aryabinin@virtuozzo.com

commit 6e1d8ea90932f77843730ada0bfea63093b7212a upstream.

wmi_dev_probe() allocates one byte less than necessary, thus subsequent sprintf() call writes trailing zero past the end of the 'buf':

BUG: KASAN: slab-out-of-bounds in vsnprintf+0xda4/0x1240 Write of size 1 at addr ffff880423529caf by task kworker/1:1/32

Call Trace: dump_stack+0xb3/0x14d print_address_description+0xd7/0x380 kasan_report+0x166/0x2b0 vsnprintf+0xda4/0x1240 sprintf+0x9b/0xd0 wmi_dev_probe+0x1c3/0x400 driver_probe_device+0x5d1/0x990 bus_for_each_drv+0x109/0x190 __device_attach+0x217/0x360 bus_probe_device+0x1ad/0x260 deferred_probe_work_func+0x10f/0x5d0 process_one_work+0xa8b/0x1dc0 worker_thread+0x20d/0x17d0 kthread+0x311/0x3d0 ret_from_fork+0x3a/0x50

Allocated by task 32: kasan_kmalloc+0xa0/0xd0 __kmalloc+0x14f/0x3e0 wmi_dev_probe+0x182/0x400 driver_probe_device+0x5d1/0x990 bus_for_each_drv+0x109/0x190 __device_attach+0x217/0x360 bus_probe_device+0x1ad/0x260 deferred_probe_work_func+0x10f/0x5d0 process_one_work+0xa8b/0x1dc0 worker_thread+0x20d/0x17d0 kthread+0x311/0x3d0 ret_from_fork+0x3a/0x50

Increment allocation size to fix this.

Fixes: 44b6b7661132 ("platform/x86: wmi: create userspace interface for drivers") Signed-off-by: Andrey Ryabinin aryabinin@virtuozzo.com Cc: stable@vger.kernel.org Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/platform/x86/wmi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -933,7 +933,7 @@ static int wmi_dev_probe(struct device * goto probe_failure; }

- buf = kmalloc(strlen(wdriver->driver.name) + 4, GFP_KERNEL); + buf = kmalloc(strlen(wdriver->driver.name) + 5, GFP_KERNEL); if (!buf) { ret = -ENOMEM; goto probe_string_failure;

Patches currently in stable-queue which might be from aryabinin@virtuozzo.com are

queue-4.15/platform-x86-wmi-fix-off-by-one-write-in-wmi_dev_probe.patch