51 lines
926 B
C
51 lines
926 B
C
/*
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* gd_security.c
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*
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* Implements buffer overflow check routines.
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*
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* Written 2004, Phil Knirsch.
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* Based on netpbm fixes by Alan Cox.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <limits.h>
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#include "gd.h"
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#include "gd_errors.h"
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int overflow2(int a, int b)
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{
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if(a <= 0 || b <= 0) {
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gd_error("One parameter to a memory allocation multiplication is negative or zero, failing operation gracefully\n");
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return 1;
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}
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if(a > INT_MAX / b) {
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gd_error("Product of memory allocation multiplication would exceed INT_MAX, failing operation gracefully\n");
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return 1;
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}
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return 0;
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}
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int overflowMul3(int a, int b, int c)
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{
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if (a < 0 || b < 0 || c < 0) {
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return 1;
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}
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if (a == 0 || b == 0 || c == 0) {
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return 0;
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}
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if (a > INT_MAX / b) {
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return 1;
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}
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if ((int64_t)a * b > INT64_MAX / c) {
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return 1;
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}
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return 0;
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}
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