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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 02:41:00 +0200 |
| commit | bfb7744aaffa551093d2e39ff9f08b6b95e05006 (patch) | |
| tree | ca4b61321b178ec1623babbc57a1bee1fcedaab2 | |
| parent | 7333799de5fca7fe8d21424557362f5eef0b9e55 (diff) | |
| download | ffmpeg-bfb7744aaffa551093d2e39ff9f08b6b95e05006.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 5bde666936..6ef63912a2 100644 --- a/libavcodec/svq3.c +++ b/libavcodec/svq3.c @@ -272,7 +272,7 @@ 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)); |