[FFmpeg-devel] [PATCH 5/5] asfdec_o: check for too small size in asf_read_unknown

[Andreas Cadhalpun]

This fixes infinite loops due to seeking back.
---
 libavformat/asfdec_o.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libavformat/asfdec_o.c b/libavformat/asfdec_o.c
index ca4a066..bc79f10 100644
--- a/libavformat/asfdec_o.c
+++ b/libavformat/asfdec_o.c
@@ -190,8 +190,13 @@ static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g)
         if ((ret = detect_unknown_subobject(s, asf->unknown_offset,
                                             asf->unknown_size)) < 0)
             return ret;
-    } else
+    } else {
+        if (size < 24) {
+            av_log(s, AV_LOG_ERROR, "Too small size %"PRIu64" (< 24).\n", size);
+            return AVERROR_INVALIDDATA;
+        }
         avio_skip(pb, size - 24);
+    }
 
     return 0;
 }
-- 
2.6.4