[FFmpeg-devel] [PATCH] webp: fix infinite loop in webp_decode_frame

[Andreas Cadhalpun]

The loop always needs at least 8 bytes for chunk_type and chunk_size.
If fewer are left, bytestream2_get_le32 just returns 0 without
reading any bytes, leading to an infinite loop.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
---
 libavcodec/webp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/webp.c b/libavcodec/webp.c
index 47e9e9e..723a847 100644
--- a/libavcodec/webp.c
+++ b/libavcodec/webp.c
@@ -1387,7 +1387,7 @@ static int webp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     }
 
     av_dict_free(&s->exif_metadata);
-    while (bytestream2_get_bytes_left(&gb) > 0) {
+    while (bytestream2_get_bytes_left(&gb) > 8) {
         char chunk_str[5] = { 0 };
 
         chunk_type = bytestream2_get_le32(&gb);
-- 
2.1.4