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ivi_common: check that scan pattern is set before using it. 

Fixes CVE-2012-2791.

CC: libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2012-12-13 19:38:20 +01:00
parent 07acdd651d
commit deabb52ab4
1 changed files with 5 additions and 0 deletions
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5
libavcodec/ivi_common.c
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@ -460,6 +460,11 @@ static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile
}
if (cbp & 1) { /* block coded ? */
if (!band->scan) {
av_log(avctx, AV_LOG_ERROR, "Scan pattern is not set.\n");
return AVERROR_INVALIDDATA;
}
scan_pos = -1;
memset(trvec, 0, num_coeffs*sizeof(trvec[0])); /* zero transform vector */
memset(col_flags, 0, sizeof(col_flags)); /* zero column flags */