[FFmpeg-cvslog] avcodec/h264idct_template: Fix integer overflow in ff_h264_chroma422_dc_dequant_idct()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Oct 15 21:35:43 2020 +0200| [d1983628394e076001cc67d85656f9842b7282a3] | committer: Michael Niedermayer

avcodec/h264idct_template: Fix integer overflow in ff_h264_chroma422_dc_dequant_idct()

Fixes: signed integer overflow: 241173056 + 1953511200 cannot be represented in type 'int'
Fixes: 26086/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5068366420901888

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d1983628394e076001cc67d85656f9842b7282a3
---

 libavcodec/h264idct_template.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264idct_template.c b/libavcodec/h264idct_template.c
index 5993ae2e6e..f19579a47c 100644
--- a/libavcodec/h264idct_template.c
+++ b/libavcodec/h264idct_template.c
@@ -278,7 +278,7 @@ void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){
     const int stride= 16*2;
     const int xStride= 16;
     int i;
-    int temp[8];
+    unsigned temp[8];
     static const uint8_t x_offset[2]={0, 16};
     dctcoef *block = (dctcoef*)_block;