On Tue, Mar 21, 2023 at 12:46:04PM -0500, Mike Christie wrote:
> On 3/21/23 12:03 PM, syzbot wrote:
> > RIP: 0010:vhost_task_start+0x22/0x40 kernel/vhost_task.c:115
> > Code: 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 53 48 89 fb e8 c3 67 2c 00 48 8d 7b 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 0a 48 8b 7b 70 5b e9 fe bd 02 00 e8 79 ec 7e 00 eb
> > RSP: 0018:ffffc90003a9fc38 EFLAGS: 00010207
> > RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000
> > RDX: 000000000000000c RSI: ffffffff81564c8d RDI: 0000000000000064
> > RBP: ffff88802b21dd40 R08: 0000000000000100 R09: ffffffff8c917cf3
> > R10: 00000000fffffff4 R11: 0000000000000000 R12: fffffffffffffff4
> > R13: ffff888075d000b0 R14: ffff888075d00000 R15: ffff888075d00008
> > FS: 0000555556247300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007ffe3d8e5ff8 CR3: 00000000215d4000 CR4: 00000000003506f0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > Call Trace:
> > <TASK>
> > vhost_worker_create drivers/vhost/vhost.c:580 [inline]
>
> The return value from vhost_task_create is incorrect if the kzalloc fails.
>
> Christian, here is a fix for what's in your tree. Do you want me to submit
> a follow up patch like this or a replacement patch for:
>
> commit 77feab3c4156 ("vhost_task: Allow vhost layer to use copy_process")
Since this has been in linux-next my tendency is to just put this fix on
top. So please slap a Fixes: tag on it and a Link to the syzbot report.
I also tend to annotate such fixes with "# mainline only":
Fixes: 77feab3c4156 ("vhost_task: Allow vhost layer to use copy_process") # mainline only
to prevent AUTOSEL from picking this up.
Thanks for taking care of this so quickly!
Christian
