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References: <Yz8rIxV7bVCcfZb0@kroah.com> <20221007013708.1946061-1-zyytlz.wz@163.com> <CAPM=9ty0+ouf+rQWhM=9XSKFOA2zxKfa00MsNBvwrQGPQm2uPQ@mail.gmail.com> <CAJedcCwxioxr+4TBTdrEjAZh97J3oroSHSgax+bxSNRXCBvkRg@mail.gmail.com> <CAPM=9twhAL+c8mOLmidY_tEhEKwCh-CTjfs5yryOk8oGjMxuug@mail.gmail.com>
Cc:     alex000young@gmail.com, security@kernel.org, airlied@linux.ie,
        gregkh@linuxfoundation.org, intel-gfx@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        1002992920@qq.com, Zheng Wang <zyytlz.wz@163.com>,
        intel-gvt-dev@lists.freedesktop.org, zhi.a.wang@intel.com
To:     Dave Airlie <airlied@gmail.com>,
        Zheng Hacker <hackerzheng666@gmail.com>,
        Zhenyu Wang <zhenyuw@linux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
From:   Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Subject: Re: [PATCH v3] drm/i915/gvt: fix double free bug in split_2MB_gtt_entry
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
Message-ID: <167110126066.5360.11413014428644610672@jlahtine-mobl.ger.corp.intel.com>
User-Agent: alot/0.8.1
Date:   Thu, 15 Dec 2022 12:47:40 +0200
Precedence: bulk

(+ Tvrtko as FYI)

Zhenyu, can you take a look at the patch ASAP.

Regards, Joonas

Quoting Dave Airlie (2022-10-27 08:12:31)
> On Thu, 27 Oct 2022 at 13:26, Zheng Hacker <hackerzheng666@gmail.com> wro=
te:
> >
> > 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 erro=
r path.
> > > >
> > > > 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?
>=20
> I'll add some more people who can probably look at it.
>=20
> Dave.