linux-kernel - Re: KASAN: invalid-free in io_sqe_files

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Message-ID: <e3ed8352-23ca-246d-088c-878f9da82c76@kernel.dk>
Date:   Sun, 10 Nov 2019 08:46:06 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+3254bc44113ae1e331ee@...kaller.appspotmail.com>,
        io-uring@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: KASAN: invalid-free in io_sqe_files_unregister

On 11/10/19 4:49 AM, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 65e19f54d29cd8559ce60cfd0d751bef7afbdc5c
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Sat Oct 26 13:20:21 2019 +0000
> 
>       io_uring: support for larger fixed file sets
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=154f483ce00000
> start commit:   5591cf00 Add linux-next specific files for 20191108
> git tree:       linux-next
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=174f483ce00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=134f483ce00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e1036c6ef52866f9
> dashboard link: https://syzkaller.appspot.com/bug?extid=3254bc44113ae1e331ee
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=116bb33ae00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=173f133ae00000
> 
> Reported-by: syzbot+3254bc44113ae1e331ee@...kaller.appspotmail.com
> Fixes: 65e19f54d29c ("io_uring: support for larger fixed file sets")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Thanks, I queued up a fix:

https://git.kernel.dk/cgit/linux-block/commit/?h=for-5.5/io_uring&id=fc2a85cb02efd7bdbd09ea5d2d9847937da7bff7

-- 
Jens Axboe