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indeo3: fix motion vector validation

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The index of the motion vector has to be checked before being
multiplied by 2 for the array index.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Hendrik Leppkes 2012-04-29 16:33:41 +00:00 committed by Derek Buitenhuis
parent ff80c68264
commit 4b7fa553a9
1 changed files with 2 additions and 2 deletions
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4
libavcodec/indeo3.c
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@ -773,12 +773,12 @@ static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
/* get motion vector index and setup the pointer to the mv set */
if (!ctx->need_resync)
ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
mv_idx = *(ctx->next_cell_data++) << 1;
mv_idx = *(ctx->next_cell_data++);
if (mv_idx >= ctx->num_vectors) {
av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");
return AVERROR_INVALIDDATA;
}
curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx];
curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];
curr_cell.tree = 1; /* enter the VQ tree */
UPDATE_BITPOS(8);
} else { /* VQ tree DATA code */