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avcodec/sbrdsp_fixed.c: remove input value limit for sbr_sum_square_c()

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Fixes: 1377/clusterfuzz-testcase-minimized-5487049807233024
Fixes: assertion failure in sbr_sum_square_c()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-02-03 15:13:03 +01:00
parent 0cac68bcf9
commit 4cde7e62db
1 changed files with 19 additions and 15 deletions
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28
libavcodec/sbrdsp_fixed.c
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@ -34,32 +34,36 @@
static SoftFloat sbr_sum_square_c(int (*x)[2], int n)
{
SoftFloat ret;
uint64_t accu, round;
uint64_t accu = 0, round;
uint64_t accu0 = 0, accu1 = 0, accu2 = 0, accu3 = 0;
int i, nz, nz0;
unsigned u;
nz = 0;
for (i = 0; i < n; i += 2) {
// Larger values are inavlid and could cause overflows of accu.
av_assert2(FFABS(x[i + 0][0]) >> 30 == 0);
accu0 += (int64_t)x[i + 0][0] * x[i + 0][0];
av_assert2(FFABS(x[i + 0][1]) >> 30 == 0);
accu1 += (int64_t)x[i + 0][1] * x[i + 0][1];
av_assert2(FFABS(x[i + 1][0]) >> 30 == 0);
accu2 += (int64_t)x[i + 1][0] * x[i + 1][0];
av_assert2(FFABS(x[i + 1][1]) >> 30 == 0);
accu3 += (int64_t)x[i + 1][1] * x[i + 1][1];
}
nz0 = 15;
while ((accu0|accu1|accu2|accu3) >> 62) {
if ((accu0|accu1|accu2|accu3) > UINT64_MAX - INT32_MIN*(int64_t)INT32_MIN || i+2>=n) {
accu0 >>= nz;
accu1 >>= nz;
accu2 >>= nz;
accu3 >>= nz;
while ((accu0|accu1|accu2|accu3) > (UINT64_MAX - accu) >> 2) {
accu0 >>= 1;
accu1 >>= 1;
accu2 >>= 1;
accu3 >>= 1;
nz0 --;
accu >>= 1;
nz ++;
}
accu = accu0 + accu1 + accu2 + accu3;
accu += accu0 + accu1 + accu2 + accu3;
accu0 = accu1 = accu2 = accu3 = 0;
}
}
nz0 = 15 - nz;
u = accu >> 32;
if (u) {