4.20-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet edumazet@google.com
[ Upstream commit 1e027960edfaa6a43f9ca31081729b716598112b ]
syzbot found another add_timer() issue, this time in net/hsr [1]
Let's use mod_timer() which is safe.
[1] kernel BUG at kernel/time/timer.c:1136! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 15909 Comm: syz-executor.3 Not tainted 5.0.0+ #97 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop2' (00000000f5629718): kobject_uevent_env RIP: 0010:add_timer kernel/time/timer.c:1136 [inline] RIP: 0010:add_timer+0x654/0xbe0 kernel/time/timer.c:1134 Code: 0f 94 c5 31 ff 44 89 ee e8 09 61 0f 00 45 84 ed 0f 84 77 fd ff ff e8 bb 5f 0f 00 e8 07 10 a0 ff e9 68 fd ff ff e8 ac 5f 0f 00 <0f> 0b e8 a5 5f 0f 00 0f 0b e8 9e 5f 0f 00 4c 89 b5 58 ff ff ff e9 RSP: 0018:ffff8880656eeca0 EFLAGS: 00010246 kobject: 'loop2' (00000000f5629718): fill_kobj_path: path = '/devices/virtual/block/loop2' RAX: 0000000000040000 RBX: 1ffff1100caddd9a RCX: ffffc9000c436000 RDX: 0000000000040000 RSI: ffffffff816056c4 RDI: ffff88806a2f6cc8 RBP: ffff8880656eed58 R08: ffff888067f4a300 R09: ffff888067f4abc8 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88806a2f6cc0 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880656eed30 FS: 00007fc2019bf700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000738000 CR3: 0000000067e8e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hsr_check_announce net/hsr/hsr_device.c:99 [inline] hsr_check_carrier_and_operstate+0x567/0x6f0 net/hsr/hsr_device.c:120 hsr_netdev_notify+0x297/0xa00 net/hsr/hsr_main.c:51 notifier_call_chain+0xc7/0x240 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] dev_open net/core/dev.c:1436 [inline] dev_open+0x143/0x160 net/core/dev.c:1424 team_port_add drivers/net/team/team.c:1203 [inline] team_add_slave+0xa07/0x15d0 drivers/net/team/team.c:1933 do_set_master net/core/rtnetlink.c:2358 [inline] do_set_master+0x1d4/0x230 net/core/rtnetlink.c:2332 do_setlink+0x966/0x3510 net/core/rtnetlink.c:2493 rtnl_setlink+0x271/0x3b0 net/core/rtnetlink.c:2747 rtnetlink_rcv_msg+0x465/0xb00 net/core/rtnetlink.c:5192 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2485 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5210 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 sock_write_iter+0x27c/0x3e0 net/socket.c:923 call_write_iter include/linux/fs.h:1869 [inline] do_iter_readv_writev+0x5e0/0x8e0 fs/read_write.c:680 do_iter_write fs/read_write.c:956 [inline] do_iter_write+0x184/0x610 fs/read_write.c:937 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1001 do_writev+0xf6/0x290 fs/read_write.c:1036 __do_sys_writev fs/read_write.c:1109 [inline] __se_sys_writev fs/read_write.c:1106 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1106 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457f29 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc2019bec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457f29 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2019bf6d4 R13: 00000000004c4a60 R14: 00000000004dd218 R15: 00000000ffffffff
Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Signed-off-by: Eric Dumazet edumazet@google.com Reported-by: syzbot syzkaller@googlegroups.com Cc: Arvid Brodin arvid.brodin@alten.se Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/hsr/hsr_device.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-)
--- a/net/hsr/hsr_device.c +++ b/net/hsr/hsr_device.c @@ -94,9 +94,8 @@ static void hsr_check_announce(struct ne && (old_operstate != IF_OPER_UP)) { /* Went up */ hsr->announce_count = 0; - hsr->announce_timer.expires = jiffies + - msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); - add_timer(&hsr->announce_timer); + mod_timer(&hsr->announce_timer, + jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); }
if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP)) @@ -332,6 +331,7 @@ static void hsr_announce(struct timer_li { struct hsr_priv *hsr; struct hsr_port *master; + unsigned long interval;
hsr = from_timer(hsr, t, announce_timer);
@@ -343,18 +343,16 @@ static void hsr_announce(struct timer_li hsr->protVersion); hsr->announce_count++;
- hsr->announce_timer.expires = jiffies + - msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); + interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); } else { send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK, hsr->protVersion);
- hsr->announce_timer.expires = jiffies + - msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); + interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); }
if (is_admin_up(master->dev)) - add_timer(&hsr->announce_timer); + mod_timer(&hsr->announce_timer, jiffies + interval);
rcu_read_unlock(); }