1 // RUN: %clang_cc1 -analyze -analyzer-checker=alpha.unix.Stream -analyzer-store region -verify %s
2
3 typedef __typeof__(sizeof(int)) size_t;
4 typedef struct _IO_FILE FILE;
5 #define SEEK_SET 0 /* Seek from beginning of file. */
6 #define SEEK_CUR 1 /* Seek from current position. */
7 #define SEEK_END 2 /* Seek from end of file. */
8 extern FILE *fopen(const char *path, const char *mode);
9 extern FILE *tmpfile(void);
10 extern int fclose(FILE *fp);
11 extern size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
12 extern int fseek (FILE *__stream, long int __off, int __whence);
13 extern long int ftell (FILE *__stream);
14 extern void rewind (FILE *__stream);
15
f1(void)16 void f1(void) {
17 FILE *p = fopen("foo", "r");
18 char buf[1024];
19 fread(buf, 1, 1, p); // expected-warning {{Stream pointer might be NULL}}
20 fclose(p);
21 }
22
f2(void)23 void f2(void) {
24 FILE *p = fopen("foo", "r");
25 fseek(p, 1, SEEK_SET); // expected-warning {{Stream pointer might be NULL}}
26 fclose(p);
27 }
28
f3(void)29 void f3(void) {
30 FILE *p = fopen("foo", "r");
31 ftell(p); // expected-warning {{Stream pointer might be NULL}}
32 fclose(p);
33 }
34
f4(void)35 void f4(void) {
36 FILE *p = fopen("foo", "r");
37 rewind(p); // expected-warning {{Stream pointer might be NULL}}
38 fclose(p);
39 }
40
f5(void)41 void f5(void) {
42 FILE *p = fopen("foo", "r");
43 if (!p)
44 return;
45 fseek(p, 1, SEEK_SET); // no-warning
46 fseek(p, 1, 3); // expected-warning {{The whence argument to fseek() should be SEEK_SET, SEEK_END, or SEEK_CUR}}
47 fclose(p);
48 }
49
f6(void)50 void f6(void) {
51 FILE *p = fopen("foo", "r");
52 fclose(p);
53 fclose(p); // expected-warning {{Try to close a file Descriptor already closed. Cause undefined behaviour}}
54 }
55
f7(void)56 void f7(void) {
57 FILE *p = tmpfile();
58 ftell(p); // expected-warning {{Stream pointer might be NULL}}
59 fclose(p);
60 }
61
f8(int c)62 void f8(int c) {
63 FILE *p = fopen("foo.c", "r");
64 if(c)
65 return; // expected-warning {{Opened File never closed. Potential Resource leak}}
66 fclose(p);
67 }
68
f9(void)69 FILE *f9(void) {
70 FILE *p = fopen("foo.c", "r");
71 if (p)
72 return p; // no-warning
73 else
74 return 0;
75 }
76
pr7831(FILE * fp)77 void pr7831(FILE *fp) {
78 fclose(fp); // no-warning
79 }
80
81 // PR 8081 - null pointer crash when 'whence' is not an integer constant
pr8081(FILE * stream,long offset,int whence)82 void pr8081(FILE *stream, long offset, int whence) {
83 fseek(stream, offset, whence);
84 }
85
86