Blame SOURCES/0002-CVE-2019-9433-VP8-Fix-use-after-free-in-postproc.patch
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From 93681819b22d3f42cf5fdfa85701f38e5bab10dd Mon Sep 17 00:00:00 2001
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From: Wim Taymans <wtaymans@redhat.com>
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Date: Wed, 25 Mar 2020 13:42:07 +0100
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Subject: [PATCH 2/2] CVE-2019-9433: VP8: Fix use-after-free in postproc.
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The pointer in vp8 postproc refers to show_frame_mi which is only
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updated on show frame. However, when there is a no-show frame which also
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changes the size (thus new frame buffers allocated), show_frame_mi is
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not updated with new frame buffer memory.
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Change the pointer in postproc to mi which is always updated.
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Bug: 842265
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---
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vp8/common/postproc.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/vp8/common/postproc.c b/vp8/common/postproc.c
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index d67ee8a57..8c292d616 100644
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--- a/vp8/common/postproc.c
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+++ b/vp8/common/postproc.c
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@@ -65,7 +65,7 @@ void vp8_deblock(VP8_COMMON *cm, YV12_BUFFER_CONFIG *source,
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double level = 6.0e-05 * q * q * q - .0067 * q * q + .306 * q + .0065;
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int ppl = (int)(level + .5);
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- const MODE_INFO *mode_info_context = cm->show_frame_mi;
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+ const MODE_INFO *mode_info_context = cm->mi;
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int mbr, mbc;
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/* The pixel thresholds are adjusted according to if or not the macroblock
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--
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2.25.1
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