[FFmpeg-devel] [PATCH 1/2] avcodec/h264_direct: Fix runtime error: signed integer overflow: 2147483647 - -14133 cannot be represented in type 'int'

[Michael Niedermayer]

Fixes: 755/clusterfuzz-testcase-5369072516595712

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/h264_direct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264_direct.c b/libavcodec/h264_direct.c
index cbb84665b3..798cb10c2b 100644
--- a/libavcodec/h264_direct.c
+++ b/libavcodec/h264_direct.c
@@ -39,7 +39,7 @@ static int get_scale_factor(H264SliceContext *sl,
                             int poc, int poc1, int i)
 {
     int poc0 = sl->ref_list[0][i].poc;
-    int td = av_clip_int8(poc1 - poc0);
+    int td = av_clip_int8(poc1 - (SUINT)poc0);
     if (td == 0 || sl->ref_list[0][i].parent->long_ref) {
         return 256;
     } else {
-- 
2.11.0

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