malloc.c revision ab28099e3bd4859585ccb316f9f571c8c6b035fd 
1// RUN: %clang_cc1 -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-experimental-checks -analyzer-store=region -verify %s
2typedef __typeof(sizeof(int)) size_t;
3void *malloc(size_t);
4void free(void *);
5void *realloc(void *ptr, size_t size);
6void *calloc(size_t nmemb, size_t size);
7
8void f1() {
9  int *p = malloc(12);
10  return; // expected-warning{{Allocated memory never released. Potential memory leak.}}
11}
12
13void f1_b() {
14  int *p = malloc(12); // expected-warning{{Allocated memory never released. Potential memory leak.}}
15}
16
17void f2() {
18  int *p = malloc(12);
19  free(p);
20  free(p); // expected-warning{{Try to free a memory block that has been released}}
21}
22
23// This case tests that storing malloc'ed memory to a static variable which is
24// then returned is not leaked.  In the absence of known contracts for functions
25// or inter-procedural analysis, this is a conservative answer.
26int *f3() {
27  static int *p = 0;
28  p = malloc(12);
29  return p; // no-warning
30}
31
32// This case tests that storing malloc'ed memory to a static global variable
33// which is then returned is not leaked.  In the absence of known contracts for
34// functions or inter-procedural analysis, this is a conservative answer.
35static int *p_f4 = 0;
36int *f4() {
37  p_f4 = malloc(12);
38  return p_f4; // no-warning
39}
40
41int *f5() {
42  int *q = malloc(12);
43  q = realloc(q, 20);
44  return q; // no-warning
45}
46
47void f6() {
48  int *p = malloc(12);
49  if (!p)
50    return; // no-warning
51  else
52    free(p);
53}
54
55char *doit2();
56void pr6069() {
57  char *buf = doit2();
58  free(buf);
59}
60
61void pr6293() {
62  free(0);
63}
64
65void f7() {
66  char *x = (char*) malloc(4);
67  free(x);
68  x[0] = 'a'; // expected-warning{{Use dynamically allocated memory after it is freed.}}
69}
70
71void PR6123() {
72  int *x = malloc(11); // expected-warning{{Cast a region whose size is not a multiple of the destination type size.}}
73}
74
75void PR7217() {
76  int *buf = malloc(2); // expected-warning{{Cast a region whose size is not a multiple of the destination type size.}}
77  buf[1] = 'c'; // not crash
78
79}
80