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avcodec/aacps: Fix multiple integer overflow in map_val_34_to_20()

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Fixes: avcodec/aacps.c:511:40: runtime error: signed integer overflow: 1509077651 + 758068176 cannot be represented in type 'int'
Fixes: 2678/clusterfuzz-testcase-minimized-4702787684270080

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-22 00:44:14 +02:00
parent 850a45aef1
commit 0764fe1d09
1 changed files with 4 additions and 4 deletions
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8
libavcodec/aacps.c
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@ -504,13 +504,13 @@ static void map_idx_34_to_20(int8_t *par_mapped, const int8_t *par, int full)
static void map_val_34_to_20(INTFLOAT par[PS_MAX_NR_IIDICC])
{
#if USE_FIXED
par[ 0] = (int)(((int64_t)(par[ 0] + (par[ 1]>>1)) * 1431655765 + \
par[ 0] = (int)(((int64_t)(par[ 0] + (unsigned)(par[ 1]>>1)) * 1431655765 + \
0x40000000) >> 31);
par[ 1] = (int)(((int64_t)((par[ 1]>>1) + par[ 2]) * 1431655765 + \
par[ 1] = (int)(((int64_t)((par[ 1]>>1) + (unsigned)par[ 2]) * 1431655765 + \
0x40000000) >> 31);
par[ 2] = (int)(((int64_t)(par[ 3] + (par[ 4]>>1)) * 1431655765 + \
par[ 2] = (int)(((int64_t)(par[ 3] + (unsigned)(par[ 4]>>1)) * 1431655765 + \
0x40000000) >> 31);
par[ 3] = (int)(((int64_t)((par[ 4]>>1) + par[ 5]) * 1431655765 + \
par[ 3] = (int)(((int64_t)((par[ 4]>>1) + (unsigned)par[ 5]) * 1431655765 + \
0x40000000) >> 31);
#else
par[ 0] = (2*par[ 0] + par[ 1]) * 0.33333333f;