avcodec/g729_parser: Check block_size

Fixes: Infinite loop
Fixes: 17611/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ACELP_KELVIN_fuzzer-5765134928052224
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/g729_parser.c b/libavcodec/g729_parser.c
index 5a57025d626488917c490723be5d0788f984bfeb..010f688104edb2fd6e20eab15a782d727b99c316 100644 (file)
--- a/libavcodec/g729_parser.c
+++ b/libavcodec/g729_parser.c
@@ -53,6 +53,12 @@ static int g729_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
         s->duration   = avctx->frame_size;
     }
 
+    if (!s->block_size) {
+        *poutbuf      = buf;
+        *poutbuf_size = buf_size;
+        return buf_size;
+    }
+
     if (!s->remaining)
         s->remaining = s->block_size;
     if (s->remaining <= buf_size) {