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vp6dec: ensure we don't try to use a buffer with negative size

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this should never happen in valid vp6 bitstream
fix issue684

Originally committed as revision 15610 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-10-13 00:10:53 +00:00
parent f2e49553de
commit 40056c32df
1 changed files with 2 additions and 0 deletions
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2
libavcodec/vp6.c
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@ -135,6 +135,8 @@ static int vp6_parse_header(vp56_context_t *s, const uint8_t *buf, int buf_size,
if (coeff_offset) {
buf += coeff_offset;
buf_size -= coeff_offset;
if (buf_size < 0)
return 0;
if (s->use_huffman) {
s->parse_coeff = vp6_parse_coeff_huffman;
init_get_bits(&s->gb, buf, buf_size<<3);