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From:   Zheng Hacker <hackerzheng666@gmail.com>
Date:   Thu, 27 Oct 2022 11:26:41 +0800
Message-ID: <CAJedcCwxioxr+4TBTdrEjAZh97J3oroSHSgax+bxSNRXCBvkRg@mail.gmail.com>
Subject: Re: [PATCH v3] drm/i915/gvt: fix double free bug in split_2MB_gtt_entry
To:     Dave Airlie <airlied@gmail.com>
Cc:     Zheng Wang <zyytlz.wz@163.com>, gregkh@linuxfoundation.org,
        alex000young@gmail.com, security@kernel.org, airlied@linux.ie,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, 1002992920@qq.com
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Dave Airlie <airlied@gmail.com> =E4=BA=8E2022=E5=B9=B410=E6=9C=8827=E6=97=
=A5=E5=91=A8=E5=9B=9B 08:01=E5=86=99=E9=81=93=EF=BC=9A
>
> On Fri, 7 Oct 2022 at 11:38, Zheng Wang <zyytlz.wz@163.com> wrote:
> >
> > If intel_gvt_dma_map_guest_page failed, it will call
> > ppgtt_invalidate_spt, which will finally free the spt.
> > But the caller does not notice that, it will free spt again in error pa=
th.
> >
> > Fix this by spliting invalidate and free in ppgtt_invalidate_spt.
> > Only free spt when in good case.
> >
> > Reported-by: Zheng Wang <hackerzheng666@gmail.com>
> > Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
>
> Has this landed in a tree yet, since it's a possible CVE, might be
> good to merge it somewhere.
>
> Dave.
>

Hi Dave,

This patched hasn't been merged yet. Could you please help with this?

Best Regards,
Zheng Wang