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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-11-12 21:50:20 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-11-12 23:01:42 +0100 |
| commit | 7ab690bf5f4b24fca95113c0ee44f0847c9c3c6d (patch) | |
| tree | 8e78b17e920a0019b99e82ad40d55eff0b7101b3 /libavcodec/indeo4.c | |
| parent | 7581ad24a9240e9af4f344d0cb6a41fbe7ae71cd (diff) | |
| download | ffmpeg-7ab690bf5f4b24fca95113c0ee44f0847c9c3c6d.tar.gz | |
indeo4: more complete check for the scan vs block sizes.
Fixes out of array reads
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/indeo4.c')
| -rw-r--r-- | libavcodec/indeo4.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libavcodec/indeo4.c b/libavcodec/indeo4.c index 1d6d0490e6..0766ed489a 100644 --- a/libavcodec/indeo4.c +++ b/libavcodec/indeo4.c @@ -365,6 +365,7 @@ static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band, return AVERROR_INVALIDDATA; } band->scan = scan_index_to_tab[scan_indx]; + band->scan_size = band->blk_size; quant_mat = get_bits(&ctx->gb, 5); if (quant_mat == 31) { @@ -382,6 +383,11 @@ static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band, band->quant_mat = 0; return AVERROR_INVALIDDATA; } + if (band->scan_size != band->blk_size) { + av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n"); + return AVERROR_INVALIDDATA; + } + /* decode block huffman codebook */ if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &band->blk_vlc, avctx)) |