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
| // RUN: %clang_analyze_cc1 -analyzer-checker=alpha.security.MallocOverflow -verify %s
#define NULL ((void *) 0)
typedef __typeof__(sizeof(int)) size_t;
extern void * malloc(size_t);
void * f1(int n)
{
return malloc(n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
}
void * f2(int n)
{
return malloc(sizeof(int) * n); // // expected-warning {{the computation of the size of the memory allocation may overflow}}
}
void * f3()
{
return malloc(4 * sizeof(int)); // no-warning
}
struct s4
{
int n;
};
void * f4(struct s4 *s)
{
return malloc(s->n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
}
void * f5(struct s4 *s)
{
struct s4 s2 = *s;
return malloc(s2.n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
}
void * f6(int n)
{
return malloc((n + 1) * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
}
extern void * malloc (size_t);
void * f7(int n)
{
if (n > 10)
return NULL;
return malloc(n * sizeof(int)); // no-warning
}
void * f8(int n)
{
if (n < 10)
return malloc(n * sizeof(int)); // no-warning
else
return NULL;
}
void * f9(int n)
{
int * x = malloc(n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
for (int i = 0; i < n; i++)
x[i] = i;
return x;
}
void * f10(int n)
{
int * x = malloc(n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
int i = 0;
while (i < n)
x[i++] = 0;
return x;
}
void * f11(int n)
{
int * x = malloc(n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
int i = 0;
do {
x[i++] = 0;
} while (i < n);
return x;
}
void * f12(int n)
{
n = (n > 10 ? 10 : n);
int * x = malloc(n * sizeof(int)); // no-warning
for (int i = 0; i < n; i++)
x[i] = i;
return x;
}
struct s13
{
int n;
};
void * f13(struct s13 *s)
{
if (s->n > 10)
return NULL;
return malloc(s->n * sizeof(int)); // no-warning
}
void * f14(int n)
{
if (n < 0)
return NULL;
return malloc(n * sizeof(int)); // expected-warning {{the computation of the size of the memory allocation may overflow}}
}
|