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

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Date:   Wed, 30 Sep 2020 18:57:56 +0200
From:   David Sterba <dsterba@...e.cz>
To:     syzbot <syzbot+582e66e5edf36a22c7b0@...kaller.appspotmail.com>
Cc:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in btrfs_scan_one_device

On Sun, Sep 20, 2020 at 07:12:14AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    eb5f95f1 Merge tag 's390-5.9-6' of git://git.kernel.org/pu..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10a0a8bb900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ffe85b197a57c180
> dashboard link: https://syzkaller.appspot.com/bug?extid=582e66e5edf36a22c7b0
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> 
> 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+582e66e5edf36a22c7b0@...kaller.appspotmail.com

#syz fix: btrfs: fix overflow when copying corrupt csums for a message