Check output buffer size before decoding.

Originally committed as revision 15257 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mace.c

@@ -235,6 +235,11 @@ static int mace3_decode_frame(AVCodecContext *avctx,
     MACEContext *ctx = avctx->priv_data;
     int i, j, k;
 
+    if (*data_size < 2 * 3 * buf_size) {
+        av_log(avctx, AV_LOG_ERROR, "Output buffer too small!\n");
+        return -1;
+    }
+
     for(i = 0; i < avctx->channels; i++) {
         int16_t *output = samples + i;
 
@@ -266,6 +271,11 @@ static int mace6_decode_frame(AVCodecContext *avctx,
     MACEContext *ctx = avctx->priv_data;
     int i, j;
 
+    if (*data_size < 2 * 6 * buf_size) {
+        av_log(avctx, AV_LOG_ERROR, "Output buffer too small!\n");
+        return -1;
+    }
+
     for(i = 0; i < avctx->channels; i++) {
         int16_t *output = samples + i;