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avcodec/aacdec_fixed: Fix various integer overflows

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Fixes: 1377/clusterfuzz-testcase-minimized-5487049807233024

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-06 22:09:59 +02:00
parent 8ba1fc2a4a
commit ad2296ab3a
3 changed files with 18 additions and 16 deletions
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2
libavcodec/aacdec_fixed.c
View File

@ -180,7 +180,7 @@ static void subband_scale(int *dst, int *src, int scale, int offset, int len)
}
else {
s = s + 32;
round = 1 << (s-1);
round = 1U << (s-1);
for (i=0; i<len; i++) {
out = (int)((int64_t)((int64_t)src[i] * c + round) >> s);
dst[i] = out * ssign;

4
libavcodec/aacdec_template.c
View File

@ -2796,9 +2796,9 @@ static void spectral_to_sample(AACContext *ac, int samples)
int j;
/* preparation for resampler */
for(j = 0; j<samples; j++){
che->ch[0].ret[j] = (int32_t)av_clipl_int32((int64_t)che->ch[0].ret[j]<<7)+0x8000;
che->ch[0].ret[j] = (int32_t)av_clip64((int64_t)che->ch[0].ret[j]<<7, INT32_MIN, INT32_MAX-0x8000)+0x8000;
if(type == TYPE_CPE)
che->ch[1].ret[j] = (int32_t)av_clipl_int32((int64_t)che->ch[1].ret[j]<<7)+0x8000;
che->ch[1].ret[j] = (int32_t)av_clip64((int64_t)che->ch[1].ret[j]<<7, INT32_MIN, INT32_MAX-0x8000)+0x8000;
}
}
#endif /* USE_FIXED */

28
libavcodec/sbrdsp_fixed.c
View File

@ -34,8 +34,9 @@
static SoftFloat sbr_sum_square_c(int (*x)[2], int n)
{
SoftFloat ret;
int64_t accu = 0;
int i, nz, round;
uint64_t accu = 0, round;
int i, nz;
unsigned u;
for (i = 0; i < n; i += 2) {
// Larger values are inavlid and could cause overflows of accu.
@ -49,22 +50,22 @@ static SoftFloat sbr_sum_square_c(int (*x)[2], int n)
accu += (int64_t)x[i + 1][1] * x[i + 1][1];
}
i = (int)(accu >> 32);
if (i == 0) {
u = accu >> 32;
if (u == 0) {
nz = 1;
} else {
nz = 0;
while (FFABS(i) < 0x40000000) {
i <<= 1;
nz = -1;
while (u < 0x80000000U) {
u <<= 1;
nz++;
}
nz = 32 - nz;
}
round = 1 << (nz-1);
i = (int)((accu + round) >> nz);
i >>= 1;
ret = av_int2sf(i, 15 - nz);
round = 1ULL << (nz-1);
u = ((accu + round) >> nz);
u >>= 1;
ret = av_int2sf(u, 15 - nz);
return ret;
}
@ -107,7 +108,8 @@ static void sbr_qmf_deint_neg_c(int *v, const int *src)
static av_always_inline SoftFloat autocorr_calc(int64_t accu)
{
int nz, mant, expo, round;
int nz, mant, expo;
unsigned round;
int i = (int)(accu >> 32);
if (i == 0) {
nz = 1;
@ -120,7 +122,7 @@ static av_always_inline SoftFloat autocorr_calc(int64_t accu)
nz = 32-nz;
}
round = 1 << (nz-1);
round = 1U << (nz-1);
mant = (int)((accu + round) >> nz);
mant = (mant + 0x40)>>7;
mant <<= 6;