linux-kernel - Re: kernel BUG at arch/x86/mm/physaddr.c:LINE! (2)

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Date:   Thu, 4 Apr 2019 16:47:00 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     syzbot <syzbot+6c0effb5877f6b0344e2@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>, hverkuil@...all.nl,
        linux-can@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org, mchehab@...nel.org,
        mchehab@...pensource.com, mkl@...gutronix.de,
        Networking <netdev@...r.kernel.org>, socketcan@...tkopp.net,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: kernel BUG at arch/x86/mm/physaddr.c:LINE! (2)

On Wed, Mar 20, 2019 at 9:35 PM syzbot
<syzbot+6c0effb5877f6b0344e2@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 6d469a202ee73196d0df76025af80bd6a379e658
> Author: Mauro Carvalho Chehab <mchehab@...pensource.com>
> Date:   Sun May 14 17:07:21 2017 +0000
>
>      Merge tag 'v4.12-rc1' into patchwork
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12639fd7200000
> start commit:   6d469a20 Merge tag 'v4.12-rc1' into patchwork
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=15639fd7200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11639fd7200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d86f24333880b605
> dashboard link: https://syzkaller.appspot.com/bug?extid=6c0effb5877f6b0344e2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1312062b400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=131bd093400000
>
> Reported-by: syzbot+6c0effb5877f6b0344e2@...kaller.appspotmail.com
> Fixes: 6d469a20 ("Merge tag 'v4.12-rc1' into patchwork")
>
> --
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I believe this bug is caused by vivid_vid_cap_s_selection() calling
kfree(dev->bitmap_cap).
This makes little sense, as dev->bitmap_cap seems to be allocated
using vzalloc().

-- 
Alexander Potapenko
Software Engineer

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