ffmpeg: fix CVE-2024-36619

FFmpeg n6.1.1 has a vulnerability in the WAVARC decoder of the libavcodec
library which allows for an integer overflow when handling certain block types,
leading to a denial-of-service (DoS) condition.

(From OE-Core rev: 161711ba2ef14fa77fba4740b1933c68043c57c7)

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

meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2024-36619.patch

@@ -0,0 +1,36 @@
+From 28c7094b25b689185155a6833caf2747b94774a4 Mon Sep 17 00:00:00 2001
+From: Michael Niedermayer <michael@niedermayer.cc>
+Date: Thu, 4 Apr 2024 00:15:27 +0200
+Subject: [PATCH] avcodec/wavarc: fix signed integer overflow in block type
+ 6/19
+
+Fixes: signed integer overflow: -2088796289 + -91276551 cannot be represented in type 'int'
+Fixes: 67772/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-6533568953122816
+
+Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
+Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+
+CVE: CVE-2024-36619
+
+Upstream-Status: Backport [https://github.com/ffmpeg/ffmpeg/commit/28c7094b25b689185155a6833caf2747b94774a4]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ libavcodec/wavarc.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavcodec/wavarc.c b/libavcodec/wavarc.c
+index 09ed4d4..51d91a4 100644
+--- a/libavcodec/wavarc.c
++++ b/libavcodec/wavarc.c
+@@ -648,7 +648,7 @@ static int decode_5elp(AVCodecContext *avctx,
+                 for (int o = 0; o < order; o++)
+                     sum += s->filter[ch][o] * (unsigned)samples[n + 70 - o - 1];
+
+-                samples[n + 70] += ac_out[n] + (sum >> 4);
++                samples[n + 70] += ac_out[n] + (unsigned)(sum >> 4);
+             }
+
+             for (int n = 0; n < 70; n++)
+--
+2.40.0

meta/recipes-multimedia/ffmpeg/ffmpeg_6.1.1.bb

@@ -45,6 +45,7 @@ SRC_URI = " \
     file://CVE-2024-36616.patch \
     file://CVE-2024-36617.patch \
     file://CVE-2024-36618.patch \
+    file://CVE-2024-36619.patch \
 "
 
 SRC_URI[sha256sum] = "8684f4b00f94b85461884c3719382f1261f0d9eb3d59640a1f4ac0873616f968"