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void function(size_t len) {
   long *p;
   if (len == 0 || len > SIZE_MAX / sizeof(long)) {
      /* handle overflow */
   }
   p = malloc(len * sizeof(int));
   if (p == NULL) {
      /*   handle error */
   }
   /* ... */
   free(p);
}

void function(size_t len) {
   long *p;
   if (len == 0 || len > SIZE_MAX / sizeof(long)) {
      /* handle overflow */
   }
   p = malloc(len * sizeof(long));
   if (p == NULL) {
      /*   handle error */
   }
   /* ... */
   free(p);
}