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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-12-18 00:31:08 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-09 13:53:29 +0200 |
| commit | 2e26851dcd11b79152870dc9a2921920edf7655d (patch) | |
| tree | 2c99d5ff320ef45ff8576526dca7ac787b0beff5 | |
| parent | 305ae7fc02b5331995a7694ceef2d818c96c7d37 (diff) | |
| download | ffmpeg-2e26851dcd11b79152870dc9a2921920edf7655d.tar.gz | |
avcodec/simple_idct: Fix undefined integer overflow in idct4row()
Fixes: signed integer overflow: -1498310196 - 902891776 cannot be represented in type 'int'
Fixes: 28445/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5075163389493248
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 57f7e5caa324fd760aa9e134ee963e9936083c59)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/simple_idct.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libavcodec/simple_idct.c b/libavcodec/simple_idct.c index 78b29c0fe3..a6f38abfb7 100644 --- a/libavcodec/simple_idct.c +++ b/libavcodec/simple_idct.c @@ -175,7 +175,8 @@ static inline void idct4col_add(uint8_t *dest, ptrdiff_t line_size, const int16_ #define R_SHIFT 11 static inline void idct4row(int16_t *row) { - int c0, c1, c2, c3, a0, a1, a2, a3; + unsigned c0, c1, c2, c3; + int a0, a1, a2, a3; a0 = row[0]; a1 = row[1]; |