avcodec/vp8: Check bitstream input in vp7_fade_frame() before time consuming operation

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 3adfeac3d94493b54ce84c92bef499a46cb4178e..a06692c47676bcd5ec1d334d11c2c1dcdb923c61 100644 (file)
--- 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;