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

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-06-24 02:43:18 +02:00
parent 09f0429b99
commit 74af6ae021
1 changed files with 3 additions and 0 deletions
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3
libavcodec/vp8.c
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@ -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;