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

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov  9 21:19:24 2019 +0100| [f64be9da4c8b16071ec84056a61d1fc0d5d6728c] | 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>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f64be9da4c8b16071ec84056a61d1fc0d5d6728c
---

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

diff --git a/libavcodec/g729dec.c b/libavcodec/g729dec.c
index eafac8a023..282668d472 100644
--- a/libavcodec/g729dec.c
+++ b/libavcodec/g729dec.c
@@ -427,7 +427,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
         return ret;
 
-    if (buf_size % ((G729_8K_BLOCK_SIZE + (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN)) * avctx->channels) == 0) {
+    if (buf_size && buf_size % ((G729_8K_BLOCK_SIZE + (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN)) * avctx->channels) == 0) {
         packet_type = FORMAT_G729_8K;
         format = &format_g729_8k;
         //Reset voice decision