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SubjectRe: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes
From
On 5/31/22 1:55 AM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 3b46e4e44180 Add linux-next specific files for 20220531
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16e151f5f00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=ccb8d66fc9489ef
> dashboard link: https://syzkaller.appspot.com/bug?extid=b6c9b65b6753d333d833
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+b6c9b65b6753d333d833@syzkaller.appspotmail.com
>
> ================================================================================
> ================================================================================
> UBSAN: array-index-out-of-bounds in fs/io_uring.c:8860:19
> index 75 is out of range for type 'io_op_def [47]'

'def' is just set here, it's not actually used after 'opcode' has been
verified.

--
Jens Axboe

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