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// RUN: %clang_analyze_cc1 \
// RUN: -analyzer-checker=core,alpha.security.cert.env.InvalidPtr \
// RUN: -verify -Wno-unused %s
#include "../Inputs/system-header-simulator.h"
char *getenv(const char *name);
int strcmp(const char*, const char*);
char *strdup(const char*);
void free(void *memblock);
void *malloc(size_t size);
void incorrect_usage(void) {
char *tmpvar;
char *tempvar;
tmpvar = getenv("TMP");
if (!tmpvar)
return;
tempvar = getenv("TEMP");
if (!tempvar)
return;
if (strcmp(tmpvar, tempvar) == 0) { // body of strcmp is unknown
// expected-warning@-1{{use of invalidated pointer 'tmpvar' in a function call}}
}
}
void correct_usage_1(void) {
char *tmpvar;
char *tempvar;
const char *temp = getenv("TMP");
if (temp != NULL) {
tmpvar = (char *)malloc(strlen(temp)+1);
if (tmpvar != NULL) {
strcpy(tmpvar, temp);
} else {
return;
}
} else {
return;
}
temp = getenv("TEMP");
if (temp != NULL) {
tempvar = (char *)malloc(strlen(temp)+1);
if (tempvar != NULL) {
strcpy(tempvar, temp);
} else {
return;
}
} else {
return;
}
if (strcmp(tmpvar, tempvar) == 0) {
printf("TMP and TEMP are the same.\n");
} else {
printf("TMP and TEMP are NOT the same.\n");
}
free(tmpvar);
free(tempvar);
}
void correct_usage_2(void) {
char *tmpvar;
char *tempvar;
const char *temp = getenv("TMP");
if (temp != NULL) {
tmpvar = strdup(temp);
if (tmpvar == NULL) {
return;
}
} else {
return;
}
temp = getenv("TEMP");
if (temp != NULL) {
tempvar = strdup(temp);
if (tempvar == NULL) {
return;
}
} else {
return;
}
if (strcmp(tmpvar, tempvar) == 0) {
printf("TMP and TEMP are the same.\n");
} else {
printf("TMP and TEMP are NOT the same.\n");
}
free(tmpvar);
tmpvar = NULL;
free(tempvar);
tempvar = NULL;
}
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