root/ext/gd/libgd/gd_security.c

DEFINITIONS

1. overflow2

   1 /*
   2    * gd_security.c
   3    *
   4    * Implements buffer overflow check routines.
   5    *
   6    * Written 2004, Phil Knirsch.
   7    * Based on netpbm fixes by Alan Cox.
   8    *
   9  */
  10 
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14 
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <limits.h>
  18 #include "gd.h"
  19 
  20 int overflow2(int a, int b)
  21 {
  22         if(a <= 0 || b <= 0) {
  23                 php_gd_error("gd warning: one parameter to a memory allocation multiplication is negative or zero, failing operation gracefully\n");
  24                 return 1;
  25         }
  26         if(a > INT_MAX / b) {
  27                 php_gd_error("gd warning: product of memory allocation multiplication would exceed INT_MAX, failing operation gracefully\n");
  28                 return 1;
  29         }
  30         return 0;
  31 }