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
|
// RUN: %clang_analyze_cc1 -analyzer-checker=unix.MallocSizeof -verify %s
#include <stddef.h>
void *malloc(size_t size);
void *calloc(size_t nmemb, size_t size);
void *realloc(void *ptr, size_t size);
void free(void *ptr);
struct A {};
struct B {};
void foo(unsigned int unsignedInt, unsigned int readSize) {
int *ip1 = malloc(sizeof(1));
int *ip2 = malloc(4 * sizeof(int));
long *lp1 = malloc(sizeof(short)); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'long', which is incompatible with sizeof operand type 'short'}}
long *lp2 = malloc(5 * sizeof(double)); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'long', which is incompatible with sizeof operand type 'double'}}
char *cp3 = malloc(5 * sizeof(char) + 2); // no warning
unsigned char *buf = malloc(readSize + sizeof(unsignedInt)); // no warning
struct A *ap1 = calloc(1, sizeof(struct A));
struct A *ap2 = calloc(2, sizeof(*ap1));
struct A *ap3 = calloc(2, sizeof(ap1)); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct A *'}}
struct A *ap4 = calloc(3, sizeof(struct A*)); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct A *'}}
struct A *ap5 = calloc(4, sizeof(struct B)); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct B'}}
struct A *ap6 = realloc(ap5, sizeof(struct A));
struct A *ap7 = realloc(ap5, sizeof(struct B)); // expected-warning {{Result of 'realloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct B'}}
void **vpp1 = (void **)malloc(sizeof(struct A*)); // no warning
}
// Don't warn when the types differ only by constness.
void ignore_const() {
const char **x = (const char **)malloc(1 * sizeof(char *)); // no-warning
const char ***y = (const char ***)malloc(1 * sizeof(char *)); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'const char **', which is incompatible with sizeof operand type 'char *'}}
free(x);
}
int *mallocArraySize() {
static const int sTable[10];
static const int nestedTable[10][2];
int *table = malloc(sizeof sTable);
int *table1 = malloc(sizeof nestedTable);
int (*table2)[2] = malloc(sizeof nestedTable);
int (*table3)[10][2] = malloc(sizeof nestedTable);
return table;
}
int *mallocWrongArraySize() {
static const double sTable[10];
int *table = malloc(sizeof sTable); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'int', which is incompatible with sizeof operand type 'const double [10]'}}
return table;
}
|
