1// RUN: %clang_cc1 -analyze -analyzer-checker=unix.MallocSizeof -verify %s
2
3#include <stddef.h>
4
5void *malloc(size_t size);
6void *calloc(size_t nmemb, size_t size);
7void *realloc(void *ptr, size_t size);
8void free(void *ptr);
9
10struct A {};
11struct B {};
12
13void foo(unsigned int unsignedInt, unsigned int readSize) {
14  int *ip1 = malloc(sizeof(1));
15  int *ip2 = malloc(4 * sizeof(int));
16
17  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'}}
18  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'}}
19  char *cp3 = malloc(5 * sizeof(char) + 2); // no warning
20  unsigned char *buf = malloc(readSize + sizeof(unsignedInt)); // no warning
21
22  struct A *ap1 = calloc(1, sizeof(struct A));
23  struct A *ap2 = calloc(2, sizeof(*ap1));
24  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 *'}}
25  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 *'}}
26  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'}}
27  struct A *ap6 = realloc(ap5, sizeof(struct A));
28  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'}}
29}
30
31// Don't warn when the types differ only by constness.
32void ignore_const() {
33  const char **x = (const char **)malloc(1 * sizeof(char *)); // no-warning
34  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 *'}}
35  free(x);
36}
37
38int *mallocArraySize() {
39  static const int sTable[10];
40  static const int nestedTable[10][2];
41  int *table = malloc(sizeof sTable);
42  int *table1 = malloc(sizeof nestedTable);
43  int (*table2)[2] = malloc(sizeof nestedTable);
44  int (*table3)[10][2] = malloc(sizeof nestedTable);
45  return table;
46}
47
48int *mallocWrongArraySize() {
49  static const double sTable[10];
50  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]'}}
51  return table;
52}
53