From 74af6ae02100ff05f8a09fde5db4cd06509cdfba Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 24 Jun 2018 02:43:18 +0200
Subject: [PATCH] avcodec/vp8: Check bitstream input in vp7_fade_frame() before
 time consuming operation

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/vp8.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 3adfeac3d9..a06692c476 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -507,6 +507,9 @@ static int vp7_fade_frame(VP8Context *s, VP56RangeCoder *c)
     int beta  = (int8_t) vp8_rac_get_uint(c, 8);
     int ret;
 
+    if (c->end <= c->buffer && c->bits >= 0)
+        return AVERROR_INVALIDDATA;
+
     if (!s->keyframe && (alpha || beta)) {
         int width  = s->mb_width * 16;
         int height = s->mb_height * 16;
-- 
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