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mss1: check number of free colours

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Prevents out of array write.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-06-25 22:45:08 +00:00
parent 8a0cd58729
commit e3c2670539
1 changed files with 4 additions and 0 deletions
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4
libavcodec/mss1.c
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@ -783,6 +783,10 @@ static av_cold int mss1_decode_init(AVCodecContext *avctx)
av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d\n",
AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8));
c->free_colours = AV_RB32(avctx->extradata + 48);
if (c->free_colours < 0 || c->free_colours > 256) {
av_log(avctx, AV_LOG_ERROR, "Invalid free colours %d\n", c->free_colours);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "%d free colour(s)\n", c->free_colours);
avctx->coded_width = AV_RB32(avctx->extradata + 20);
avctx->coded_height = AV_RB32(avctx->extradata + 24);