kc3-lang/libtommath/mp_init_size.c

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• Hash : 08d281c4
  Author :
  Date : 2019-12-05T00:48:25
  

  introduce MP_MAX_DIGIT_COUNT to prevent overflow

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• mp_init_size.c

• #include "tommath_private.h"
  #ifdef MP_INIT_SIZE_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* init an mp_init for a given size */
  mp_err mp_init_size(mp_int *a, int size)
  {
     size = MP_MAX(MP_MIN_DIGIT_COUNT, size);
  
     if (size > MP_MAX_DIGIT_COUNT) {
        return MP_MEM;
     }
  
     /* alloc mem */
     a->dp = (mp_digit *) MP_CALLOC((size_t)size, sizeof(mp_digit));
     if (a->dp == NULL) {
        return MP_MEM;
     }
  
     /* set the members */
     a->used  = 0;
     a->alloc = size;
     a->sign  = MP_ZPOS;
  
     return MP_OKAY;
  }
  #endif
  

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