diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 8a0938d5dc..5c9443a4f4 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -308,7 +308,8 @@ static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
     value = av_malloc(size + 1);
     if (!value)
         return AVERROR(ENOMEM);
-    avio_read(pb, value, size);
+    if (avio_read(pb, value, size) != size)
+        return AVERROR_INVALIDDATA;
     value[size] = 0;
 
     AV_WL32(key, tag);