ffmpeg: fix CVE-2024-35367

FFmpeg n6.1.1 has an Out-of-bounds Read via libavcodec/ppc/vp8dsp_altivec.c,
static const vec_s8 h_subpel_filters_outer

(From OE-Core rev: 64d77d422d3c99d8a246ab03edfb54d9d185326e)

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 48 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2024-35367.patch b/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2024-35367.patch
new file mode 100644
index 0000000000..a1bec43c66
--- /dev/null
+++ b/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2024-35367.patch
@@ -0,0 +1,47 @@
+From 09e6840cf7a3ee07a73c3ae88a020bf27ca1a667 Mon Sep 17 00:00:00 2001
+From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
+Date: Wed, 13 Mar 2024 02:10:26 +0100
+Subject: [PATCH] avcodec/ppc/vp8dsp_altivec: Fix out-of-bounds access
+
+h_subpel_filters_inner[i] and h_subpel_filters_outer[i / 2]
+belong together and the former allows the range 0..6,
+so the latter needs to support 0..3. But it has only three
+elements. Add another one.
+The value for the last element has been guesstimated
+from subpel_filters in libavcodec/vp8dsp.c.
+
+This is also intended to fix FATE-failures with UBSan here:
+https://fate.ffmpeg.org/report.cgi?time=20240312011016&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemu
+
+Tested-by: Sean McGovern <gseanmcg@gmail.com>
+Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
+
+CVE: CVE-2024-35367
+
+Upstream-Status: Backport [https://github.com/ffmpeg/ffmpeg/commit/09e6840cf7a3ee07a73c3ae88a020bf27ca1a667]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ libavcodec/ppc/vp8dsp_altivec.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/libavcodec/ppc/vp8dsp_altivec.c b/libavcodec/ppc/vp8dsp_altivec.c
+index 12dac8b..061914f 100644
+--- a/libavcodec/ppc/vp8dsp_altivec.c
++++ b/libavcodec/ppc/vp8dsp_altivec.c
+@@ -50,11 +50,12 @@ static const vec_s8 h_subpel_filters_inner[7] =
+ // for 6tap filters, these are the outer two taps
+ // The zeros mask off pixels 4-7 when filtering 0-3
+ // and vice-versa
+-static const vec_s8 h_subpel_filters_outer[3] =
++static const vec_s8 h_subpel_filters_outer[4] =
+ {
+     REPT4(0, 0, 2, 1),
+     REPT4(0, 0, 3, 3),
+     REPT4(0, 0, 1, 2),
++    REPT4(0, 0, 0, 0),
+ };
+
+ #define LOAD_H_SUBPEL_FILTER(i) \
+--
+2.40.0
diff --git a/meta/recipes-multimedia/ffmpeg/ffmpeg_6.1.1.bb b/meta/recipes-multimedia/ffmpeg/ffmpeg_6.1.1.bb
index dd95629648..94d4cb82d5 100644
--- a/meta/recipes-multimedia/ffmpeg/ffmpeg_6.1.1.bb
+++ b/meta/recipes-multimedia/ffmpeg/ffmpeg_6.1.1.bb
@@ -38,6 +38,7 @@ SRC_URI = " \
     file://CVE-2023-49528.patch \
     file://CVE-2024-7055.patch \
     file://CVE-2024-35366.patch \
+    file://CVE-2024-35367.patch \
 "
 
 SRC_URI[sha256sum] = "8684f4b00f94b85461884c3719382f1261f0d9eb3d59640a1f4ac0873616f968"