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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-12-18 00:31:08 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-02-02 14:18:22 +0100 |
| commit | 9bdf7c4823a7109637f84cde0f7c0ef770e0ce8c (patch) | |
| tree | 7b33765eba904631661ca537f1b135e8dcc81122 | |
| parent | 9c6a0fa8f10e65e8ea0d58f088b830b2239f7a9d (diff) | |
| download | ffmpeg-9bdf7c4823a7109637f84cde0f7c0ef770e0ce8c.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 3b2e736538..0ef167491a 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]; |