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avcodec/hevc: Fix modulo operations

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Fixes qp fields becoming out of range
Fixes: asan_static-oob_e393a3_6998_WPP_A_ericsson_MAIN10_2.bit
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-06 02:51:20 +01:00
parent d66bab0a69
commit 4ced5d7780
2 changed files with 4 additions and 4 deletions
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4
libavcodec/hevc.c
View File

@ -688,8 +688,8 @@ static int hls_slice_header(HEVCContext *s)
s->HEVClc->first_qp_group = !s->sh.dependent_slice_segment_flag;
if (!s->pps->cu_qp_delta_enabled_flag)
s->HEVClc->qp_y = ((s->sh.slice_qp + 52 + 2 * s->sps->qp_bd_offset) %
(52 + s->sps->qp_bd_offset)) - s->sps->qp_bd_offset;
s->HEVClc->qp_y = FFUMOD(s->sh.slice_qp + 52 + 2 * s->sps->qp_bd_offset,
52 + s->sps->qp_bd_offset) - s->sps->qp_bd_offset;
s->slice_initialized = 1;

4
libavcodec/hevc_filter.c
View File

@ -160,8 +160,8 @@ void ff_hevc_set_qPy(HEVCContext *s, int xC, int yC,
if (s->HEVClc->tu.cu_qp_delta != 0) {
int off = s->sps->qp_bd_offset;
s->HEVClc->qp_y = ((qp_y + s->HEVClc->tu.cu_qp_delta + 52 + 2 * off) %
(52 + off)) - off;
s->HEVClc->qp_y = FFUMOD(qp_y + s->HEVClc->tu.cu_qp_delta + 52 + 2 * off,
52 + off) - off;
} else
s->HEVClc->qp_y = qp_y;
}