avformat/wavdec: Check for data_size overflow

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/wavdec.c

@@ -429,6 +429,11 @@ break_loop:
 
     avio_seek(pb, data_ofs, SEEK_SET);
 
+    if (data_size > (INT64_MAX>>3)) {
+        av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
+        data_size = 0;
+    }
+
     if (   data_size > 0 && sample_count && st->codec->channels
         && (data_size << 3) / sample_count / st->codec->channels > st->codec->bits_per_coded_sample) {
         av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);