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avcodec/xvididct: Fix integer overflow in MULT()

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Fixes: signed integer overflow: 23170 * 95058 cannot be represented in type 'int'
Fixes: 20295/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEG_fuzzer-5800212870463488

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 7ccb576191)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2020-01-31 23:43:57 +01:00
parent e5f325a1dd
commit 092f21af2b
1 changed files with 1 additions and 1 deletions
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libavcodec/xvididct.c
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@ -142,7 +142,7 @@ static int idct_row(short *in, const int *const tab, int rnd)
#define TAN3 0xAB0E #define TAN3 0xAB0E
#define SQRT2 0x5A82 #define SQRT2 0x5A82
#define MULT(c, x, n) (((c) * (x)) >> (n)) #define MULT(c, x, n) ((unsigned)((int)((c) * (unsigned)(x)) >> (n)))
// 12b version => #define MULT(c,x, n) ((((c) >> 3) * (x)) >> ((n) - 3)) // 12b version => #define MULT(c,x, n) ((((c) >> 3) * (x)) >> ((n) - 3))
// 12b zero-testing version: // 12b zero-testing version: