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kiss_fftndr_alloc: check for overflow (and _perhaps_ let combined dims > INT_MAX)

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This commit is contained in:
Mark Borgerding
2026-01-31 16:06:10 -05:00
parent 39c9781711
commit 8a8e66e33d
1 changed files with 20 additions and 8 deletions
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28
kiss_fftndr.c
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@ -13,15 +13,15 @@
struct kiss_fftndr_state
{
int dimReal;
int dimOther;
size_t dimOther;
kiss_fftr_cfg cfg_r;
kiss_fftnd_cfg cfg_nd;
void * tmpbuf;
};
static int prod(const int *dims, int ndims)
static size_t prod(const int *dims, int ndims)
{
int x=1;
size_t x=1;
while (ndims--)
x *= *dims++;
return x;
@ -34,18 +34,30 @@ kiss_fftndr_cfg kiss_fftndr_alloc(const int *dims,int ndims,int inverse_fft,void
kiss_fftndr_cfg st = NULL;
size_t nr=0 , nd=0,ntmp=0;
int dimReal = dims[ndims-1];
int dimOther = prod(dims,ndims-1);
size_t dimOther = prod(dims,ndims-1);
size_t memneeded;
char * ptr = NULL;
int k,check;
(void)kiss_fftr_alloc(dimReal,inverse_fft,NULL,&nr);
(void)kiss_fftnd_alloc(dims,ndims-1,inverse_fft,NULL,&nd);
ntmp =
MAX( 2*dimOther , dimReal+2) * sizeof(kiss_fft_scalar) // freq buffer for one pass
+ dimOther*(dimReal+2) * sizeof(kiss_fft_scalar); // large enough to hold entire input in case of in-place
+ dimOther*(size_t)(dimReal+2) * sizeof(kiss_fft_scalar); // large enough to hold entire input in case of in-place
memneeded = KISS_FFT_ALIGN_SIZE_UP(sizeof( struct kiss_fftndr_state )) + KISS_FFT_ALIGN_SIZE_UP(nr) + KISS_FFT_ALIGN_SIZE_UP(nd) + KISS_FFT_ALIGN_SIZE_UP(ntmp);
/* check for overflow */
check = memneeded;
for (k=0;k<ndims;++k) {
check /= dims[k];
if (check <= sizeof(kiss_fft_scalar)) {
if (lenmem!=NULL)
*lenmem = (size_t)(-1);
return NULL;
}
}
if (lenmem==NULL) {
ptr = (char*) malloc(memneeded);
}else{
@ -73,9 +85,9 @@ kiss_fftndr_cfg kiss_fftndr_alloc(const int *dims,int ndims,int inverse_fft,void
void kiss_fftndr(kiss_fftndr_cfg st,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata)
{
int k1,k2;
int dimReal = st->dimReal;
int dimOther = st->dimOther;
size_t k1,k2;
size_t dimReal = (size_t)st->dimReal;
size_t dimOther = st->dimOther;
int nrbins = dimReal/2+1;
kiss_fft_cpx * tmp1 = (kiss_fft_cpx*)st->tmpbuf;