linux-kernel - Re: KASAN: use-after-free Read in nbd_genl

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Date:   Mon, 22 Feb 2021 13:17:32 -0500
From:   Josef Bacik <josef@...icpanda.com>
To:     syzbot <syzbot+429d3f82d757c211bff3@...kaller.appspotmail.com>,
        axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, nbd@...er.debian.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in nbd_genl_connect

On 2/22/21 3:25 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    f40ddce8 Linux 5.11
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=179e8d22d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e53d04227c52a0df
> dashboard link: https://syzkaller.appspot.com/bug?extid=429d3f82d757c211bff3
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d190cad00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13dc8a82d00000
> 
> Bisection is inconclusive: the issue happens on the oldest tested release.
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1128ae60d00000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1328ae60d00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1528ae60d00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+429d3f82d757c211bff3@...kaller.appspotmail.com
> 

#syz test:  git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git 
nbd-kasan-fix