[FFmpeg-devel] [PATCH] avformat/apngdec: exit probing when skipping is not possible.

[Benoit Fouet]

---
Found an infinite loop on probing while zzuf'ing.
---
 libavformat/apngdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/apngdec.c b/libavformat/apngdec.c
index 189480e..d97b015 100644
--- a/libavformat/apngdec.c
+++ b/libavformat/apngdec.c
@@ -87,7 +87,7 @@ static int apng_probe(AVProbeData *p)
         /* we don't check IDAT size, as this is the last tag
          * we check, and it may be larger than the probe buffer */
         if (tag != MKTAG('I', 'D', 'A', 'T') &&
-            len > bytestream2_get_bytes_left(&gb))
+            len + 4 > bytestream2_get_bytes_left(&gb))
             return 0;
 
         switch (tag) {
-- 
2.2.0