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Merge commit '94aefb1932be882fd93f66cf790ceb19ff575c19'

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* commit '94aefb1932be882fd93f66cf790ceb19ff575c19':
  4xm: do not overread the source buffer in decode_p_block

Conflicts:
	libavcodec/4xm.c

The checks are replaced by av_assert0() as the conditions should
be impossible. If these asserts fail, there is a bug elsewhere

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-13 14:10:06 +02:00
commit 27e8298c03
1 changed files with 2 additions and 0 deletions
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2
libavcodec/4xm.c
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@ -375,6 +375,7 @@ static int decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src,
log2w, log2h, stride)) < 0)
return ret;
} else if (code == 3 && f->version < 2) {
av_assert0(start <= src && src <= end);
mcdc(dst, src, log2w, h, stride, 1, 0);
} else if (code == 4) {
if (bytestream2_get_bytes_left(&f->g) < 1) {
@ -396,6 +397,7 @@ static int decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src,
av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n");
return AVERROR_INVALIDDATA;
}
av_assert0(start <= src && src <= end);
mcdc(dst, src, log2w, h, stride, 0, bytestream2_get_le16u(&f->g2));
} else if (code == 6) {
if (bytestream2_get_bytes_left(&f->g2) < 4) {