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

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Message-ID: <0000000000003ad7db05b8229802@google.com>
Date:   Tue, 05 Jan 2021 00:00:05 -0800
From:   syzbot <syzbot+2b5c012223e37b7c2a88@...kaller.appspotmail.com>
To:     ebiggers@...gle.com, jack@...e.cz, jhubbard@...dia.com,
        junxiao.bi@...cle.com, liao.pingfang@....com.cn,
        linux-kernel@...r.kernel.org, reiserfs-devel@...r.kernel.org,
        rkovhaev@...il.com, syzkaller-bugs@...glegroups.com,
        william.kucharski@...cle.com, willy@...radead.org
Subject: Re: KASAN: use-after-free Read in reiserfs_fill_super

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=113a2d57500000
start commit:   b3298500 Merge tag 'for-5.10/dm-fixes' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e49433cfed49b7d9
dashboard link: https://syzkaller.appspot.com/bug?extid=2b5c012223e37b7c2a88
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12ad719b500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11193117500000

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