linux-kernel - Re: [PATCH v3] drm/i915/gvt: fix double free bug in split_2MB_gtt

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Date:   Thu, 15 Dec 2022 12:47:40 +0200
From:   Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:     Dave Airlie <airlied@...il.com>,
        Zheng Hacker <hackerzheng666@...il.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc:     alex000young@...il.com, security@...nel.org, airlied@...ux.ie,
        gregkh@...uxfoundation.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        1002992920@...com, Zheng Wang <zyytlz.wz@....com>,
        intel-gvt-dev@...ts.freedesktop.org, zhi.a.wang@...el.com
Subject: Re: [PATCH v3] drm/i915/gvt: fix double free bug in split_2MB_gtt_entry

(+ 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@...il.com> wrote:
> >
> > Dave Airlie <airlied@...il.com> 于2022年10月27日周四 08:01写道：
> > >
> > > On Fri, 7 Oct 2022 at 11:38, Zheng Wang <zyytlz.wz@....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 path.
> > > >
> > > > Fix this by spliting invalidate and free in ppgtt_invalidate_spt.
> > > > Only free spt when in good case.
> > > >
> > > > Reported-by: Zheng Wang <hackerzheng666@...il.com>
> > > > Signed-off-by: Zheng Wang <zyytlz.wz@....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?
> 
> I'll add some more people who can probably look at it.
> 
> Dave.