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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-11-04 01:19:20 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-11-05 22:13:16 +0100 |
| commit | e131b8cedb00043dcc97cc05ca04749ec8ff57de (patch) | |
| tree | be09cf13a231b522a31abaa9905ae41db4bb3fad /libavcodec/h264idct_template.c | |
| parent | e06bdc3c37f4fc756247bc5ebe576f2624b05e24 (diff) | |
avcodec/h264idct_template: Fix integer overflows in ff_h264_idct8_add()
Fixes: runtime error: signed integer overflow: -503316480 + -2013265038 cannot be represented in type 'int'
Fixes: 3805/clusterfuzz-testcase-minimized-6578427831255040
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/h264idct_template.c')
| -rw-r--r-- | libavcodec/h264idct_template.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavcodec/h264idct_template.c b/libavcodec/h264idct_template.c index fbd07cb8d5..7526bdd812 100644 --- a/libavcodec/h264idct_template.c +++ b/libavcodec/h264idct_template.c @@ -91,10 +91,10 @@ void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){ const int a5 = -block[i+1*8] + (unsigned)block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1); const int a7 = block[i+3*8] + (unsigned)block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1); - const int b1 = (a7>>2) + a1; - const int b3 = a3 + (a5>>2); - const int b5 = (a3>>2) - a5; - const int b7 = a7 - (a1>>2); + const int b1 = (a7>>2) + (unsigned)a1; + const int b3 = (unsigned)a3 + (a5>>2); + const int b5 = (a3>>2) - (unsigned)a5; + const int b7 = (unsigned)a7 - (a1>>2); block[i+0*8] = b0 + b7; block[i+7*8] = b0 - b7; |