linux-kernel - Re: general protection fault in jffs2_parse

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Date:   Mon, 25 Jan 2021 10:36:36 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+9765367bb86a19d38732@...kaller.appspotmail.com>
Cc:     anmol.karan123@...il.com, David Howells <dhowells@...hat.com>,
        dwmw2@...radead.org, jamie@...iainc.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mtd@...ts.infradead.org, lizhe67@...wei.com,
        Richard Weinberger <richard@....at>,
        Eric Sandeen <sandeen@...deen.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: general protection fault in jffs2_parse_param

On Sun, Jan 17, 2021 at 5:14 PM syzbot
<syzbot+9765367bb86a19d38732@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit a61df3c413e49b0042f9caf774c58512d1cc71b7
> Author: Jamie Iles <jamie@...iainc.com>
> Date:   Mon Oct 12 13:12:04 2020 +0000
>
>     jffs2: Fix NULL pointer dereference in rp_size fs option parsing
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15cb91e7500000
> start commit:   bf3e7628 Merge branch 'mtd/fixes' of git://git.kernel.org/..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61033507391c77ff
> dashboard link: https://syzkaller.appspot.com/bug?extid=9765367bb86a19d38732
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13d81f32500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13516852500000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: jffs2: Fix NULL pointer dereference in rp_size fs option parsing
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: jffs2: Fix NULL pointer dereference in rp_size fs option parsing