[FFmpeg-cvslog] avcodec/g729dec: require buf_size to be non 0

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov  9 21:19:24 2019 +0100| [0b49c74fe177fad620dfe3c358d9215e9dbe752f] | committer: Michael Niedermayer

avcodec/g729dec: require buf_size to be non 0

The 0 case was added with the support for multiple packets. It
appears unintended and causes extra complexity and out of array
accesses (though within padding)

No testcase

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit f64be9da4c8b16071ec84056a61d1fc0d5d6728c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0b49c74fe177fad620dfe3c358d9215e9dbe752f
---

 libavcodec/g729dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/g729dec.c b/libavcodec/g729dec.c
index 32218e5989..908c12a73a 100644
--- a/libavcodec/g729dec.c
+++ b/libavcodec/g729dec.c
@@ -416,7 +416,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
         return ret;
     out_frame = (int16_t*) frame->data[0];
 
-    if (buf_size % 10 == 0) {
+    if (buf_size && buf_size % 10 == 0) {
         packet_type = FORMAT_G729_8K;
         format = &format_g729_8k;
         //Reset voice decision