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avcodec/hevc_ps: Sanity checks for some log2_* values 

log2 values which imply numeric overflow are not supported

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 205b2ba3d6)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-02-25 15:51:28 +01:00
parent 41ca0489ba
commit c417b7b566
1 changed files with 20 additions and 1 deletions
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21
libavcodec/hevc_ps.c
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@ -768,11 +768,30 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
log2_diff_max_min_transform_block_size = get_ue_golomb_long(gb);
sps->log2_max_trafo_size = log2_diff_max_min_transform_block_size + sps->log2_min_tb_size;
if (sps->log2_min_tb_size >= sps->log2_min_cb_size) {
if (sps->log2_min_cb_size < 3 || sps->log2_min_cb_size > 30) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid value %d for log2_min_cb_size", sps->log2_min_cb_size);
ret = AVERROR_INVALIDDATA;
goto err;
}
if (sps->log2_diff_max_min_coding_block_size > 30) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid value %d for log2_diff_max_min_coding_block_size", sps->log2_diff_max_min_coding_block_size);
ret = AVERROR_INVALIDDATA;
goto err;
}
if (sps->log2_min_tb_size >= sps->log2_min_cb_size || sps->log2_min_tb_size < 2) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid value for log2_min_tb_size");
ret = AVERROR_INVALIDDATA;
goto err;
}
if (log2_diff_max_min_transform_block_size < 0 || log2_diff_max_min_transform_block_size > 30) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid value %d for log2_diff_max_min_transform_block_size", log2_diff_max_min_transform_block_size);
ret = AVERROR_INVALIDDATA;
goto err;
}
sps->max_transform_hierarchy_depth_inter = get_ue_golomb_long(gb);
sps->max_transform_hierarchy_depth_intra = get_ue_golomb_long(gb);