outofbound.c revision c4d2c9074be6eb2091086eddd6c8f052f3b245c8 
1// RUN: %clang_cc1 -Wno-array-bounds -analyze -analyzer-checker=core,core.experimental -analyzer-store=region -verify %s
2
3typedef __typeof(sizeof(int)) size_t;
4void *malloc(size_t);
5void *calloc(size_t, size_t);
6
7char f1() {
8  char* s = "abcd";
9  char c = s[4]; // no-warning
10  return s[5] + c; // expected-warning{{Access out-of-bound array element (buffer overflow)}}
11}
12
13void f2() {
14  int *p = malloc(12);
15  p[3] = 4; // expected-warning{{Access out-of-bound array element (buffer overflow)}}
16}
17
18struct three_words {
19  int c[3];
20};
21
22struct seven_words {
23  int c[7];
24};
25
26void f3() {
27  struct three_words a, *p;
28  p = &a;
29  p[0] = a; // no-warning
30  p[1] = a; // expected-warning{{Access out-of-bound array element (buffer overflow)}}
31}
32
33void f4() {
34  struct seven_words c;
35  struct three_words a, *p = (struct three_words *)&c;
36  p[0] = a; // no-warning
37  p[1] = a; // no-warning
38  p[2] = a; // expected-warning{{Access out-of-bound array element (buffer overflow)}}
39}
40
41void f5() {
42  char *p = calloc(2,2);
43  p[3] = '.'; // no-warning
44  p[4] = '!'; // expected-warning{{out-of-bound}}
45}
46
47void f6() {
48  char a[2];
49  int *b = (int*)a;
50  b[1] = 3; // expected-warning{{out-of-bound}}
51}
52
53void f7() {
54  struct three_words a;
55  a.c[3] = 1; // expected-warning{{out-of-bound}}
56}
57
58void vla(int a) {
59  if (a == 5) {
60    int x[a];
61    x[4] = 4; // no-warning
62    x[5] = 5; // expected-warning{{out-of-bound}}
63  }
64}
65
66void sizeof_vla(int a) {
67  if (a == 5) {
68    char x[a];
69    int y[sizeof(x)];
70    y[4] = 4; // no-warning
71    y[5] = 5; // expected-warning{{out-of-bound}}
72  }
73}
74
75void alloca_region(int a) {
76  if (a == 5) {
77    char *x = __builtin_alloca(a);
78    x[4] = 4; // no-warning
79    x[5] = 5; // expected-warning{{out-of-bound}}
80  }
81}
82
83int symbolic_index(int a) {
84  int x[2] = {1, 2};
85  if (a == 2) {
86    return x[a]; // expected-warning{{out-of-bound}}
87  }
88  return 0;
89}
90
91int symbolic_index2(int a) {
92  int x[2] = {1, 2};
93  if (a < 0) {
94    return x[a]; // expected-warning{{out-of-bound}}
95  }
96  return 0;
97}
98