From: Zheng Hacker <hackerzheng666@gmail.com>
To: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zheng Wang <zyytlz.wz@163.com>,
zhi.a.wang@intel.com, alex000young@gmail.com,
security@kernel.org, intel-gvt-dev@lists.freedesktop.org,
tvrtko.ursulin@linux.intel.com, airlied@linux.ie,
gregkh@linuxfoundation.org, intel-gfx@lists.freedesktop.org,
joonas.lahtinen@linux.intel.com, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, 1002992920@qq.com,
airlied@gmail.com
Subject: Re: [PATCH v5] drm/i915/gvt: fix double free bug in split_2MB_gtt_entry
Date: Wed, 21 Dec 2022 13:01:26 +0800 [thread overview]
Message-ID: <CAJedcCyvSW_RAOrzUkWM8Li8x6Jkd0FL6uCXCz2Jzk33dng4jQ@mail.gmail.com> (raw)
In-Reply-To: <20221221025857.GG30028@zhen-hp.sh.intel.com>
Zhenyu Wang <zhenyuw@linux.intel.com> 于2022年12月21日周三 11:01写道:
>
> On 2022.12.20 17:40:14 +0800, Zheng Wang wrote:
> > If intel_gvt_dma_map_guest_page failed, it will call
> > ppgtt_invalidate_spt, which will finally free the spt. But the
> > caller function ppgtt_populate_spt_by_guest_entry does not notice
> > that, it will free spt again in its error path.
>
> indent
Yeap :)
> > + if (ret)
> > + goto err;
> > sub_se.val64 = se->val64;
> >
> > /* Copy the PAT field from PDE. */
> > @@ -1231,6 +1229,18 @@ static int split_2MB_gtt_entry(struct intel_vgpu *vgpu,
> > ops->set_pfn(se, sub_spt->shadow_page.mfn);
> > ppgtt_set_shadow_entry(spt, se, index);
> > return 0;
> > +err:
> > + /* Undone the existing mappings of DMA addr. */
>
> We need a verb here for Undo.
Get it.
>
> > + for_each_present_shadow_entry(sub_spt, &sub_se, sub_index) {
> > + gvt_vdbg_mm("invalidate 4K entry\n");
> > + ppgtt_invalidate_pte(sub_spt, &sub_se);
> > + }
> > + /* Release the new allocated spt. */
> > + trace_spt_change(sub_spt->vgpu->id, "release", sub_spt,
> > + sub_spt->guest_page.gfn, sub_spt->shadow_page.type);
> > + ppgtt_free_spt(sub_spt);
> > + sub_spt = NULL;
>
> Not need to reset local variable that has no use then.
>
> I'll handle these trivial fixes during the merge.
>
Very thanks for that.
Best regards,
Zheng Wang
next prev parent reply other threads:[~2022-12-21 5:01 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tencent_ED24158E83CB9885E8BDD173EB5896B51906@qq.com>
2022-09-19 9:30 ` [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry Jani Nikula
2022-09-19 9:55 ` Zheng Hacker
2022-09-21 9:13 ` Zheng Hacker
2022-09-28 3:33 ` [PATCH] drm/i915/gvt: fix double free " Zheng Wang
2022-10-02 14:18 ` Greg KH
2022-10-03 4:36 ` Zheng Hacker
2022-10-06 16:58 ` [PATCH v2] " Zheng Wang
2022-10-06 19:23 ` Greg KH
2022-10-07 0:39 ` Zheng Hacker
2022-10-07 1:37 ` [PATCH v3] " Zheng Wang
2022-10-27 0:01 ` Dave Airlie
2022-10-27 3:26 ` Zheng Hacker
2022-10-27 5:12 ` Dave Airlie
2022-10-30 15:10 ` Zheng Hacker
2022-12-15 10:47 ` Joonas Lahtinen
2022-12-15 11:33 ` Wang, Zhi A
2022-12-15 13:26 ` Zheng Hacker
2022-12-19 7:57 ` [Intel-gfx] " Zheng Wang
2022-12-19 8:22 ` Wang, Zhi A
2022-12-19 9:21 ` Zheng Wang
2022-12-19 12:46 ` [PATCH v4] [PATCH v4] " Zheng Wang
2022-12-19 12:52 ` [RESEND PATCH " Zheng Wang
2022-12-20 8:22 ` Zhenyu Wang
2022-12-20 9:03 ` Zheng Hacker
2022-12-20 9:40 ` [PATCH v5] " Zheng Wang
2022-12-21 2:58 ` Zhenyu Wang
2022-12-21 5:01 ` Zheng Hacker [this message]
2022-12-29 16:56 ` [PATCH v6] " Zheng Wang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAJedcCyvSW_RAOrzUkWM8Li8x6Jkd0FL6uCXCz2Jzk33dng4jQ@mail.gmail.com \
--to=hackerzheng666@gmail.com \
--cc=1002992920@qq.com \
--cc=airlied@gmail.com \
--cc=airlied@linux.ie \
--cc=alex000young@gmail.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=gregkh@linuxfoundation.org \
--cc=intel-gfx@lists.freedesktop.org \
--cc=intel-gvt-dev@lists.freedesktop.org \
--cc=joonas.lahtinen@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=security@kernel.org \
--cc=tvrtko.ursulin@linux.intel.com \
--cc=zhenyuw@linux.intel.com \
--cc=zhi.a.wang@intel.com \
--cc=zyytlz.wz@163.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).