From 74474750f1ac522730dae271a5ea5003caa8b73c Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Date: Wed, 6 Jan 2016 14:09:22 +0100
Subject: [PATCH] asfdec_o: prevent overflow causing seekback
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This fixes infinite loops.

Reviewed-by: Alexandra Hájková <alexandra.khirnova@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
---
 libavformat/asfdec_o.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/asfdec_o.c b/libavformat/asfdec_o.c
index bc168d3516..b81519fb18 100644
--- a/libavformat/asfdec_o.c
+++ b/libavformat/asfdec_o.c
@@ -167,7 +167,7 @@ static void swap_guid(ff_asf_guid guid)
 
 static void align_position(AVIOContext *pb,  int64_t offset, uint64_t size)
 {
-    if (avio_tell(pb) != offset + size)
+    if (size < INT64_MAX - offset && avio_tell(pb) != offset + size)
         avio_seek(pb, offset + size, SEEK_SET);
 }