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avcodec/h264: Check *log2_weight_denom 

Fixes undefined behavior
Fixes: signal_sigsegv_14768d2_2248_cov_3629497219_h264_h264___pi_20070614T182942.h264
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-18 03:16:39 +01:00
parent 3281fa8925
commit 61296d41e2
1 changed files with 10 additions and 0 deletions
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10
libavcodec/h264.c
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@ -991,6 +991,16 @@ int ff_pred_weight_table(H264Context *h)
h->luma_log2_weight_denom = get_ue_golomb(&h->gb);
if (h->sps.chroma_format_idc)
h->chroma_log2_weight_denom = get_ue_golomb(&h->gb);
if (h->luma_log2_weight_denom > 7U) {
av_log(h->avctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", h->luma_log2_weight_denom);
h->luma_log2_weight_denom = 0;
}
if (h->chroma_log2_weight_denom > 7U) {
av_log(h->avctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", h->chroma_log2_weight_denom);
h->chroma_log2_weight_denom = 0;
}
luma_def = 1 << h->luma_log2_weight_denom;
chroma_def = 1 << h->chroma_log2_weight_denom;