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avcodec/4xm: Fix signed integer overflows in idct()

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Fixes: signed integer overflow: 20242 * 121095 cannot be represented in type 'int'
Fixes: 15310/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5737051745419264

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 2bbea155bf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-27 00:15:03 +02:00
parent 3150e804d5
commit 9b01f16af8
1 changed files with 1 additions and 1 deletions
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libavcodec/4xm.c
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@ -158,7 +158,7 @@ typedef struct FourXContext {
#define FIX_1_847759065 121095
#define FIX_2_613125930 171254
#define MULTIPLY(var, const) (((var) * (const)) >> 16)
#define MULTIPLY(var, const) ((int)((var) * (unsigned)(const)) >> 16)
static void idct(int16_t block[64])
{