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 overflow2(int a,int b)20int 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 } 32
