linux-kernel - Re: [syzbot] KASAN: use-after-free Read in filp

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Message-ID: <YpyNWgSXNityT14C@zeniv-ca.linux.org.uk>
Date:   Sun, 5 Jun 2022 11:02:50 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     syzbot <syzbot+47dd250f527cb7bebf24@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in filp_close

On Sun, Jun 05, 2022 at 01:49:19AM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    952923ddc011 Merge tag 'pull-18-rc1-work.namei' of git://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=173fb6dbf00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3096247591885bfa
> dashboard link: https://syzkaller.appspot.com/bug?extid=47dd250f527cb7bebf24
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114f7bcdf00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1659a94ff00000

_Very_ interesting.  Has anything of that sort been observed on -next?

Because everything in that branch had been present there since at least
January.