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avcodec/h264_direct: Check CO-POCs before use 

Fixes harmless integer overflow
Fixes mozilla bug 1230286

Found-by: Tyson Smith
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-04 00:31:44 +01:00
parent cafb195604
commit 77a644e6fa
1 changed files with 4 additions and 0 deletions
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4
libavcodec/h264_direct.c
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@ -137,6 +137,10 @@ void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *
if (h->picture_structure == PICT_FRAME) {
int cur_poc = h->cur_pic_ptr->poc;
int *col_poc = sl->ref_list[1][0].parent->field_poc;
if (col_poc[0] == INT_MAX && col_poc[1] == INT_MAX) {
av_log(h->avctx, AV_LOG_ERROR, "co located POCs unavailable\n");
sl->col_parity = 1;
} else
sl->col_parity = (FFABS(col_poc[0] - cur_poc) >=
FFABS(col_poc[1] - cur_poc));
ref1sidx =