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h264: reject mismatching luma/chroma bit depths during sps parsing

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There is no point in delaying the check and it avoids bugs with a
half-initialized context.

Fixes invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-11-28 10:54:35 +01:00
parent 9a026c7298
commit bfd26b7ce6
2 changed files with 5 additions and 6 deletions
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6
libavcodec/h264.c
View File

@ -3053,12 +3053,6 @@ static int h264_set_parameter_from_sps(H264Context *h)
if (h->avctx->has_b_frames < 2)
h->avctx->has_b_frames = !h->low_delay;
if (h->sps.bit_depth_luma != h->sps.bit_depth_chroma) {
avpriv_request_sample(h->avctx,
"Different chroma and luma bit depth");
return AVERROR_PATCHWELCOME;
}
if (h->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
h->cur_chroma_format_idc != h->sps.chroma_format_idc) {
if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 10) {

5
libavcodec/h264_ps.c
View File

@ -341,6 +341,11 @@ int ff_h264_decode_seq_parameter_set(H264Context *h)
}
sps->bit_depth_luma = get_ue_golomb(&h->gb) + 8;
sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
if (sps->bit_depth_chroma != sps->bit_depth_luma) {
avpriv_request_sample(h->avctx,
"Different chroma and luma bit depth");
goto fail;
}
sps->transform_bypass = get_bits1(&h->gb);
decode_scaling_matrices(h, sps, NULL, 1,
sps->scaling_matrix4, sps->scaling_matrix8);