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avcodec/jpeg2000dwt: Fix integer overflows in sr_1d53()

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Fixes: 5918/clusterfuzz-testcase-minimized-5120505435652096

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 2018-02-18 00:11:33 +01:00
parent cbcbefdc3b
commit 793347a545
1 changed files with 4 additions and 4 deletions
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8
libavcodec/jpeg2000dwt.c
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@ -305,22 +305,22 @@ static void dwt_encode97_int(DWTContext *s, int *t)
t[i] = (t[i] + ((1<<I_PRESHIFT)>>1)) >> I_PRESHIFT;
}
static void sr_1d53(int *p, int i0, int i1)
static void sr_1d53(unsigned *p, int i0, int i1)
{
int i;
if (i1 <= i0 + 1) {
if (i0 == 1)
p[1] >>= 1;
p[1] = (int)p[1] >> 1;
return;
}
extend53(p, i0, i1);
for (i = (i0 >> 1); i < (i1 >> 1) + 1; i++)
p[2 * i] -= (p[2 * i - 1] + p[2 * i + 1] + 2) >> 2;
p[2 * i] -= (int)(p[2 * i - 1] + p[2 * i + 1] + 2) >> 2;
for (i = (i0 >> 1); i < (i1 >> 1); i++)
p[2 * i + 1] += (p[2 * i] + p[2 * i + 2]) >> 1;
p[2 * i + 1] += (int)(p[2 * i] + p[2 * i + 2]) >> 1;
}
static void dwt_decode53(DWTContext *s, int *t)