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check for overflow on 32 bit platform (closes #120)

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Mark Borgerding
2025-11-26 10:39:17 -05:00
parent 7bce4153c6
commit 1b08316582
1 changed files with 5 additions and 1 deletions
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6
kiss_fft.c
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@ -6,7 +6,7 @@
* See COPYING file for more information. * See COPYING file for more information.
*/ */
#include <stdint.h>
#include "_kiss_fft_guts.h" #include "_kiss_fft_guts.h"
/* The guts header contains all the multiplication and addition macros that are defined for /* The guts header contains all the multiplication and addition macros that are defined for
fixed or floating point complex numbers. It also delares the kf_ internal functions. fixed or floating point complex numbers. It also delares the kf_ internal functions.
@ -339,6 +339,10 @@ kiss_fft_cfg kiss_fft_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem
KISS_FFT_ALIGN_CHECK(mem) KISS_FFT_ALIGN_CHECK(mem)
kiss_fft_cfg st=NULL; kiss_fft_cfg st=NULL;
// check for overflow condition {memneeded > SIZE_MAX}.
if (nfft >= (SIZE_MAX - 2*sizeof(struct kiss_fft_state))/sizeof(kiss_fft_cpx))
return NULL;
size_t memneeded = KISS_FFT_ALIGN_SIZE_UP(sizeof(struct kiss_fft_state) size_t memneeded = KISS_FFT_ALIGN_SIZE_UP(sizeof(struct kiss_fft_state)
+ sizeof(kiss_fft_cpx)*(nfft-1)); /* twiddle factors*/ + sizeof(kiss_fft_cpx)*(nfft-1)); /* twiddle factors*/