diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index 6b12466756..e00f01d0c9 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -376,10 +376,10 @@ static void read_uslt(AVFormatContext *s, AVIOContext *pb, int taglen,
     lang[3] = '\0';
     taglen -= 3;
 
-    if (decode_str(s, pb, encoding, &descriptor, &taglen) < 0)
+    if (decode_str(s, pb, encoding, &descriptor, &taglen) < 0 || taglen < 0)
         goto error;
 
-    if (decode_str(s, pb, encoding, &text, &taglen) < 0)
+    if (decode_str(s, pb, encoding, &text, &taglen) < 0 || taglen < 0)
         goto error;
 
     // FFmpeg does not support hierarchical metadata, so concatenate the keys.