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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-09-18 17:03:55 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-09-24 02:40:59 +0200 |
| commit | 6b66cd8c40df5e5837997dafc799056607ce4861 (patch) | |
| tree | 42d15f1ba61e8052307ac282cf0cf659bdac2f6c | |
| parent | ab2d991382c2cb8c7e319f804eb6b83ad863c1a0 (diff) | |
| download | ffmpeg-6b66cd8c40df5e5837997dafc799056607ce4861.tar.gz | |
avcodec/svq3: Fix overflow in svq3_add_idct_c()
Fixes: runtime error: signed integer overflow: 2147392585 + 524288 cannot be represented in type 'int'
Fixes: 3348/clusterfuzz-testcase-minimized-4809500517203968
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2c933c51687db958d8045d25ed87848342e869f6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/svq3.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c index 01998652bb..b16ae1bfa6 100644 --- a/libavcodec/svq3.c +++ b/libavcodec/svq3.c @@ -285,7 +285,7 @@ static void svq3_add_idct_c(uint8_t *dst, int16_t *block, const unsigned z1 = 13 * (block[i + 4 * 0] - block[i + 4 * 2]); const unsigned z2 = 7 * block[i + 4 * 1] - 17 * block[i + 4 * 3]; const unsigned z3 = 17 * block[i + 4 * 1] + 7 * block[i + 4 * 3]; - const int rr = (dc + 0x80000); + const int rr = (dc + 0x80000u); dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((int)((z0 + z3) * qmul + rr) >> 20)); dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((int)((z1 + z2) * qmul + rr) >> 20)); |