linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference in __lookup

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Date:   Fri, 08 Jan 2021 23:20:08 -0800
From:   syzbot <syzbot+3db80bbf66b88d68af9d@...kaller.appspotmail.com>
To:     jack@...e.cz, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, rkovhaev@...il.com,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow

syzbot suspects this issue was fixed by commit:

commit d24396c5290ba8ab04ba505176874c4e04a2d53c
Author: Rustam Kovhaev <rkovhaev@...il.com>
Date:   Sun Nov 1 14:09:58 2020 +0000

    reiserfs: add check for an invalid ih_entry_count

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=111480e7500000
start commit:   a68a0262 mm/madvise: remove racy mm ownership check
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e597c2b53c984cd8
dashboard link: https://syzkaller.appspot.com/bug?extid=3db80bbf66b88d68af9d
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1737b8a7500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1697246b500000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: reiserfs: add check for an invalid ih_entry_count

For information about bisection process see: https://goo.gl/tpsmEJ#bisection