@@ -306,12 +306,14 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)

         /* if audio chunks are present, put them to stack and retrieve later */

         for(i = 0; i < 7; i++) {

             if(flags & 1) {

-                unsigned int size;

+                uint32_t size;

                 uint8_t *tmpbuf;

                 size = avio_rl32(s->pb) - 4;

-                if(size + 4L > frame_size)

+                if (!size || size + 4L > frame_size) {

+                    av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");

                     return AVERROR_INVALIDDATA;

+                }

                 frame_size -= size;

                 frame_size -= 4;

                 smk->curstream++;