1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
| // RUN: rm -f %t
// RUN: %clang_analyze_cc1 -fblocks -analyzer-checker=core,unix.Malloc -analyzer-output=plist -verify -o %t -analyzer-config eagerly-assume=false %s
// RUN: tail -n +11 %t | %normalize_plist | diff -ub %S/Inputs/expected-plists/malloc-plist.c.plist -
typedef __typeof(sizeof(int)) size_t;
void *malloc(size_t);
void free(void *);
void *realloc(void *ptr, size_t size);
void diagnosticTest(int in) {
if (in > 5) {
int *p = malloc(12);
*p = 0;
(*p)++;
}
in++; // expected-warning {{leak}}
}
void myArrayAllocation() {
int **A;
A = malloc(2*sizeof(int*));
A[0] = 0;
}//expected-warning{{Potential leak}}
void reallocDiagnostics() {
char * buf = malloc(100);
char * tmp;
tmp = (char*)realloc(buf, 0x1000000);
if (!tmp) {
return;// expected-warning {{leak}}
}
buf = tmp;
free(buf);
}
void *wrapper() {
void *x = malloc(100);
// This is intentionally done to test diagnostic emission.
if (x)
return x;
return 0;
}
void test_wrapper() {
void *buf = wrapper();
(void) buf;
}//expected-warning{{Potential leak}}
// Test what happens when the same call frees and allocated memory.
// Also tests the stack hint for parameters, when they are passed directly or via pointer.
void my_free(void *x) {
free(x);
}
void my_malloc_and_free(void **x) {
*x = malloc(100);
if (*x)
my_free(*x);
return;
}
void *test_double_action_call() {
void *buf;
my_malloc_and_free(&buf);
return buf; //expected-warning{{Use of memory after it is freed}}
}
// Test stack hint for 'reallocation failed'.
char *my_realloc(char *buf) {
char *tmp;
tmp = (char*)realloc(buf, 0x1000000);
if (!tmp) {
return tmp;
}
return tmp;
}
void reallocIntra() {
char *buf = (char *)malloc(100);
buf = my_realloc(buf);
free(buf);//expected-warning{{Potential leak}}
}
// Test stack hint when returning a result.
static char *malloc_wrapper_ret() {
return (char*)malloc(12);
}
void use_ret() {
char *v;
v = malloc_wrapper_ret();
}//expected-warning{{Potential leak}}
// Passing a block as a parameter to an inlined call for which we generate
// a stack hint message caused crashes.
// rdar://problem/21291971
void myfree_takingblock(void (^ignored)(void), int *p) {
free(p);
}
void call_myfree_takingblock() {
void (^some_block)(void) = ^void(void) { };
int *p = malloc(sizeof(int));
myfree_takingblock(some_block, p);
*p = 3;//expected-warning{{Use of memory after it is freed}}
}
// Test that we refer to the last symbol used in the leak diagnostic.
void LeakedSymbol(int in) {
int *m = 0;
int *p;
p = (int*)malloc(12);
*p = 0;
(*p)++;
m = p;
p = 0;
(*m)++;
in++;//expected-warning{{Potential leak}}
}
// Tests that exercise running remove dead bindings at Call exit.
static void function_with_leak1() {
char *x = (char*)malloc(12);
} //expected-warning{{Potential leak}}
void use_function_with_leak1() {
function_with_leak1();
int y = 0;
}
static void function_with_leak2() {
char *x = (char*)malloc(12);
int m = 0; //expected-warning{{Potential leak}}
}
void use_function_with_leak2() {
function_with_leak2();
}
static void function_with_leak3(int y) {
char *x = (char*)malloc(12);
if (y)
y++;
}//expected-warning{{Potential leak}}
void use_function_with_leak3(int y) {
function_with_leak3(y);
}
static void function_with_leak4(int y) {
char *x = (char*)malloc(12);
if (y)
y++;
else
y--;//expected-warning{{Potential leak}}
}
void use_function_with_leak4(int y) {
function_with_leak4(y);
}
int anotherFunction5() {
return 5;
}
static int function_with_leak5() {
char *x = (char*)malloc(12);
return anotherFunction5();//expected-warning{{Potential leak}}
}
void use_function_with_leak5() {
function_with_leak5();
}
void anotherFunction6(int m) {
m++;
}
static void function_with_leak6() {
char *x = (char*)malloc(12);
anotherFunction6(3);//expected-warning{{Potential leak}}
}
void use_function_with_leak6() {
function_with_leak6();
}
static void empty_function(){
}
void use_empty_function() {
empty_function();
}
static char *function_with_leak7() {
return (char*)malloc(12);
}
void use_function_with_leak7() {
function_with_leak7();
}//expected-warning{{Potential memory leak}}
// Test that we do not print the name of a variable not visible from where
// the issue is reported.
int *my_malloc() {
int *p = malloc(12);
return p;
}
void testOnlyRefferToVisibleVariables() {
my_malloc();
} // expected-warning{{Potential memory leak}}
struct PointerWrapper{
int*p;
};
int *my_malloc_into_struct() {
struct PointerWrapper w;
w.p = malloc(12);
return w.p;
}
void testMyMalloc() {
my_malloc_into_struct();
} // expected-warning{{Potential memory leak}}
|