linux-kernel - Re: KASAN: null-ptr-deref Read in refcount_sub_and_test

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Message-ID: <000000000000dc7fc70599131995@google.com>
Date:   Fri, 06 Dec 2019 17:30:00 -0800
From:   syzbot <syzbot+0468b73bdbb243217224@...kaller.appspotmail.com>
To:     hverkuil-cisco@...all.nl, kyungmin.park@...sung.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        m.szyprowski@...sung.com, mchehab+samsung@...nel.org,
        mchehab@...nel.org, pawel@...iak.com,
        syzkaller-bugs@...glegroups.com, tfiga@...omium.org
Subject: Re: KASAN: null-ptr-deref Read in refcount_sub_and_test_checked (2)

syzbot suspects this bug was fixed by commit:

commit 62dcb4f41836bd3c44b5b651bb6df07ea4cb1551
Author: Hans Verkuil <hverkuil-cisco@...all.nl>
Date:   Thu Nov 8 12:23:37 2018 +0000

     media: vb2: check memory model for VIDIOC_CREATE_BUFS

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14972e41e00000
start commit:   ccda4af0 Linux 4.20-rc2
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=4a0a89f12ca9b0f5
dashboard link: https://syzkaller.appspot.com/bug?extid=0468b73bdbb243217224
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16d20893400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=118f5a2b400000

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

#syz fix: media: vb2: check memory model for VIDIOC_CREATE_BUFS

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