[FFmpeg-cvslog] avformat/flvenc: Check audio packet size

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jul 28 15:03:50 2018 +0200| [0026d007428a1ef5cd4e8f54bafc54c0306beab9] | committer: Michael Niedermayer

avformat/flvenc: Check audio packet size

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

Found-by: #CHEN HONGXU# <HCHEN017 at e.ntu.edu.sg>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 6b67d7f05918f7a1ee8fc6ff21355d7e8736aa10)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0026d007428a1ef5cd4e8f54bafc54c0306beab9
---

 libavformat/flvenc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index 899b07ea7b..e966c36c65 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -879,6 +879,11 @@ 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;