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indeo4: Validate scantable dimension

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit cd78e934c2)

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2013-07-12 18:10:05 +02:00
parent be71990da6
commit 4ec5c35850
1 changed files with 6 additions and 0 deletions
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6
libavcodec/indeo4.c
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@ -353,6 +353,12 @@ static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
return AVERROR_INVALIDDATA;
}
if (scan_indx > 4 && scan_indx < 10) {
if (band->blk_size != 4)
return AVERROR_INVALIDDATA;
} else if (band->blk_size != 8)
return AVERROR_INVALIDDATA;
band->scan = scan_index_to_tab[scan_indx];
band->quant_mat = get_bits(&ctx->gb, 5);