[FFmpeg-cvslog] indeo3: fix motion vector validation

[Hendrik Leppkes]

ffmpeg | branch: master | Hendrik Leppkes <h.leppkes at gmail.com> | Wed Jan 25 17:37:26 2012 +0100| [6071644287d2a7471d906b688cb7253a5ceaaa8a] | committer: Michael Niedermayer

indeo3: fix motion vector validation

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 at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6071644287d2a7471d906b688cb7253a5ceaaa8a
---

 libavcodec/indeo3.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavcodec/indeo3.c b/libavcodec/indeo3.c
index ce84d72..fc38f5e 100644
--- a/libavcodec/indeo3.c
+++ b/libavcodec/indeo3.c
@@ -772,13 +772,12 @@ 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];
-                if(ctx->mc_vectors)
-                    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 */