KASAN: use-after-free Read in soft_cursor

[Dmitry Vyukov]

On Fri, Dec 6, 2019 at 5:34 PM syzbot
<syzbot+cf43fb300aa142fb024b at syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 2de50e9674fc4ca3c6174b04477f69eb26b4ee31
> Author: Russell Currey <ruscur at russell.cc>
> Date:   Mon Feb 8 04:08:20 2016 +0000
>
>      powerpc/powernv: Remove support for p5ioc2

Another weird one, I must be missing something obvious about how git
bisect works... I keep adding these to:
https://github.com/google/syzkaller/issues/1527

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1512d1bce00000
> start commit:   b0d4beaa Merge branch 'next.autofs' of git://git.kernel.or..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1712d1bce00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1312d1bce00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f07a23020fd7d21a
> dashboard link: https://syzkaller.appspot.com/bug?extid=cf43fb300aa142fb024b
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1745a90ee00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1361042ae00000
>
> Reported-by: syzbot+cf43fb300aa142fb024b at syzkaller.appspotmail.com
> Fixes: 2de50e9674fc ("powerpc/powernv: Remove support for p5ioc2")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
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