[FFmpeg-devel] [PATCH] avcodec/h264_cabac: Tighten allowed coeff_abs range

[Michael Niedermayer]

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

Based on limits in "8.5 Transform coefficient decoding process and picture
construction process prior to deblocking  filter process"
---
 libavcodec/h264_cabac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264_cabac.c b/libavcodec/h264_cabac.c
index ec5fc74b9b..815149a501 100644
--- a/libavcodec/h264_cabac.c
+++ b/libavcodec/h264_cabac.c
@@ -1735,7 +1735,7 @@ decode_cabac_residual_internal(const H264Context *h, H264SliceContext *sl,
 \
             if( coeff_abs >= 15 ) { \
                 int j = 0; \
-                while (get_cabac_bypass(CC) && j < 30) { \
+                while (get_cabac_bypass(CC) && j < 16+7) { \
                     j++; \
                 } \
 \
-- 
2.16.1