diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 7a7e765353..01090b6947 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -498,6 +498,8 @@ static int wav_read_header(AVFormatContext *s)
             wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
             avio_rl24(pb);
             wav->smv_block_size = avio_rl24(pb);
+            if (!wav->smv_block_size)
+                return AVERROR_INVALIDDATA;
             avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
             vst->duration = avio_rl24(pb);
             avio_rl24(pb);