ffmpeg: Fix CVE-2018-15822

Fixes: Assertion failure
Fixes: assert_flvenc.c:941_1.swf

(From OE-Core rev: 23393330a599403085437cb62169bb3a2375c07a)

Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 38 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2018-15822.patch b/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2018-15822.patch
new file mode 100644
index 0000000000..7d5868a72a
--- /dev/null
+++ b/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2018-15822.patch
@@ -0,0 +1,37 @@
+From 6b67d7f05918f7a1ee8fc6ff21355d7e8736aa10 Mon Sep 17 00:00:00 2001
+From: Michael Niedermayer <michael@niedermayer.cc>
+Date: Sat, 28 Jul 2018 15:03:50 +0200
+Subject: [PATCH] avformat/flvenc: Check audio packet size
+
+Fixes: Assertion failure
+Fixes: assert_flvenc.c:941_1.swf
+
+Upstream-Status: Backport [https://github.com/FFmpeg/FFmpeg/commit/6b67d7f05918f7a1ee8fc6ff21355d7e8736aa10]
+CVE: CVE-2018-15822
+
+Found-by: #CHEN HONGXU# <HCHEN017@e.ntu.edu.sg>
+Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
+---
+ libavformat/flvenc.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
+index 1c552a3e6b..e4863f1fc7 100644
+--- a/libavformat/flvenc.c
++++ b/libavformat/flvenc.c
+@@ -883,6 +883,11 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
+     int flags = -1, flags_size, ret;
+     int64_t cur_offset = avio_tell(pb);
+ 
++    if (par->codec_type == AVMEDIA_TYPE_AUDIO && !pkt->size) {
++        av_log(s, AV_LOG_WARNING, "Empty audio Packet\n");
++        return AVERROR(EINVAL);
++    }
++
+     if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
+         par->codec_id == AV_CODEC_ID_VP6  || par->codec_id == AV_CODEC_ID_AAC)
+         flags_size = 2;
+-- 
+2.17.1
+
diff --git a/meta/recipes-multimedia/ffmpeg/ffmpeg_4.0.2.bb b/meta/recipes-multimedia/ffmpeg/ffmpeg_4.0.2.bb
index 57731e81e6..74c8e6692f 100644
--- a/meta/recipes-multimedia/ffmpeg/ffmpeg_4.0.2.bb
+++ b/meta/recipes-multimedia/ffmpeg/ffmpeg_4.0.2.bb
@@ -25,6 +25,7 @@ LIC_FILES_CHKSUM = "file://COPYING.GPLv2;md5=b234ee4d69f5fce4486a80fdaf4a4263 \
 
 SRC_URI = "https://www.ffmpeg.org/releases/${BP}.tar.xz \
            file://mips64_cpu_detection.patch \
+           file://CVE-2018-15822.patch \
            "
 SRC_URI[md5sum] = "ae0bfdf809306a212b4f0e6eb8d1c75e"
 SRC_URI[sha256sum] = "a95c0cc9eb990e94031d2183f2e6e444cc61c99f6f182d1575c433d62afb2f97"