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avcodec/h264_cabac: Tighten allowed coeff_abs range 

Fixes: integer overflows
Reported-by: "Xiaohan Wang (王消寒)" <xhwang@chromium.org>

Based on limits in "8.5 Transform coefficient decoding process and picture
construction process prior to deblocking  filter process"

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-14 00:32:30 +01:00
parent fb580731c1
commit f26a63c4ee
1 changed files with 1 additions and 1 deletions
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libavcodec/h264_cabac.c
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@ -1735,7 +1735,7 @@ decode_cabac_residual_internal(const H264Context *h, H264SliceContext *sl,
\ \
if( coeff_abs >= 15 ) { \ if( coeff_abs >= 15 ) { \
int j = 0; \ int j = 0; \
while (get_cabac_bypass(CC) && j < 30) { \ while (get_cabac_bypass(CC) && j < 16+7) { \
j++; \ j++; \
} \ } \
\ \