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

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Date:   Thu, 4 Apr 2019 16:54:43 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     syzbot <syzbot+6c0effb5877f6b0344e2@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>, 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 Thu, Apr 4, 2019 at 4:51 PM Hans Verkuil <hverkuil@...all.nl> wrote:
>
> On 4/4/19 4:47 PM, Alexander Potapenko wrote:
> > 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")
> >>
> >> --
> >> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> >> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@...glegroups.com.
> >> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000462a4105848c8e12%40google.com.
> >> For more options, visit https://groups.google.com/d/optout.
> >
> > 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().
> >
>
> Yup, that should be vfree. There was a similar problem with bitmap_out that
> I fixed, but it looks I missed this one. Can you make a patch?
Yes, I've almost hit the send button :)
> Thanks,
>
>         Hans



-- 
Alexander Potapenko
Software Engineer

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