diff --git a/libavcodec/webp.c b/libavcodec/webp.c
index efa864a6f141dc7eeb8ff8191fe327da086c42d3..1e97487ebfdec38d7ea87334afe833576e6f9d52 100644
--- a/libavcodec/webp.c
+++ b/libavcodec/webp.c
@@ -665,6 +665,9 @@ static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
     while (y < img->frame->height) {
         int v;
 
+        if (get_bits_left(&s->gb) < 0)
+            return AVERROR_INVALIDDATA;
+
         hg = get_huffman_group(s, img, x, y);
         v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb);
         if (v < NUM_LITERAL_CODES) {