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indeo5: check motion vectors.

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fixes out of frame reading

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2012-03-26 02:24:36 +02:00
parent 33f39c02aa
commit c855ece101
2 changed files with 11 additions and 1 deletions
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11
libavcodec/indeo5.c
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@@ -450,7 +450,7 @@ static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
IVITile *tile, AVCodecContext *avctx)
{
int x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
mv_scale, blks_per_mb;
mv_scale, blks_per_mb, s;
IVIMbInfo *mb, *ref_mb;
int row_offset = band->mb_size * band->pitch;
@@ -550,6 +550,15 @@ static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
}
}
s= band->is_halfpel;
if (mb->type)
if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
x + ((mb->mv_x+s)>>s) + band->mb_size - 1
+ (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize - 1) {
av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
return AVERROR_INVALIDDATA;
}
mb++;
if (ref_mb)
ref_mb++;