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vqavideo: return error if image size is not a multiple of block size

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The decoder assumes in various places that the image size
is a multiple of the block size, and there is no obvious
way to support odd sizes.  Bailing out early if the header
specifies a bad size avoids various errors later on.

Fixes CVE-2012-0947.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard
2012-04-23 13:16:33 +01:00
parent e5356ebf22
commit 58b2e0f0f2
1 changed files with 6 additions and 0 deletions
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6
libavcodec/vqavideo.c
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@@ -151,6 +151,12 @@ static av_cold int vqa_decode_init(AVCodecContext *avctx)
return -1; return -1;
} }
if (s->width & (s->vector_width - 1) ||
s->height & (s->vector_height - 1)) {
av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
return AVERROR_INVALIDDATA;
}
/* allocate codebooks */ /* allocate codebooks */
s->codebook_size = MAX_CODEBOOK_SIZE; s->codebook_size = MAX_CODEBOOK_SIZE;
s->codebook = av_malloc(s->codebook_size); s->codebook = av_malloc(s->codebook_size);