blob: 580862b0138b67a296a504656bcb494fae453472 (
plain)
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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* Example of a multilevel wrapper around malloc/free, with a double-'free'. */
/* { dg-additional-options "-fdiagnostics-show-line-numbers -fdiagnostics-path-format=inline-events -fanalyzer-checker=malloc -fdiagnostics-show-caret" } */
/* { dg-enable-nn-line-numbers "" } */
#include <stdlib.h>
void *wrapped_malloc (size_t size)
{
return malloc (size);
}
void wrapped_free (void *ptr)
{
free (ptr); /* { dg-warning "double-'free' of 'ptr' \\\[CWE-415\\\]" } */
}
typedef struct boxed_int
{
int i;
} boxed_int;
boxed_int *
make_boxed_int (int i)
{
boxed_int *result = (boxed_int *)wrapped_malloc (sizeof (boxed_int));
if (!result)
abort ();
result->i = i;
return result;
}
void
free_boxed_int (boxed_int *bi)
{
wrapped_free (bi);
}
void test (int i)
{
boxed_int *obj = make_boxed_int (i);
free_boxed_int (obj);
free_boxed_int (obj);
}
/* double-'free'. */
/* { dg-begin-multiline-output "" }
NN | free (ptr);
| ^~~~~~~~~~
'test': events 1-2
|
| NN | void test (int i)
| | ^~~~
| | |
| | (1) entry to 'test'
| NN | {
| NN | boxed_int *obj = make_boxed_int (i);
| | ~~~~~~~~~~~~~~~~~~
| | |
| | (2) calling 'make_boxed_int' from 'test'
|
+--> 'make_boxed_int': events 3-4
|
| NN | make_boxed_int (int i)
| | ^~~~~~~~~~~~~~
| | |
| | (3) entry to 'make_boxed_int'
| NN | {
| NN | boxed_int *result = (boxed_int *)wrapped_malloc (sizeof (boxed_int));
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (4) calling 'wrapped_malloc' from 'make_boxed_int'
|
+--> 'wrapped_malloc': events 5-6
|
| NN | void *wrapped_malloc (size_t size)
| | ^~~~~~~~~~~~~~
| | |
| | (5) entry to 'wrapped_malloc'
| NN | {
| NN | return malloc (size);
| | ~~~~~~~~~~~~~
| | |
| | (6) allocated here
|
<------+
|
'make_boxed_int': events 7-10
|
| NN | boxed_int *result = (boxed_int *)wrapped_malloc (sizeof (boxed_int));
| | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (7) returning to 'make_boxed_int' from 'wrapped_malloc'
| NN | if (!result)
| | ~
| | |
| | (8) assuming 'result' is non-NULL
| | (9) following 'false' branch (when 'result' is non-NULL)...
| NN | abort ();
| NN | result->i = i;
| | ~~~~~~~~~~~~~
| | |
| | (10) ...to here
|
<------+
|
'test': events 11-12
|
| NN | boxed_int *obj = make_boxed_int (i);
| | ^~~~~~~~~~~~~~~~~~
| | |
| | (11) returning to 'test' from 'make_boxed_int'
| NN |
| NN | free_boxed_int (obj);
| | ~~~~~~~~~~~~~~~~~~~~
| | |
| | (12) calling 'free_boxed_int' from 'test'
|
+--> 'free_boxed_int': events 13-14
|
| NN | free_boxed_int (boxed_int *bi)
| | ^~~~~~~~~~~~~~
| | |
| | (13) entry to 'free_boxed_int'
| NN | {
| NN | wrapped_free (bi);
| | ~~~~~~~~~~~~~~~~~
| | |
| | (14) calling 'wrapped_free' from 'free_boxed_int'
|
+--> 'wrapped_free': events 15-16
|
| NN | void wrapped_free (void *ptr)
| | ^~~~~~~~~~~~
| | |
| | (15) entry to 'wrapped_free'
| NN | {
| NN | free (ptr);
| | ~~~~~~~~~~
| | |
| | (16) first 'free' here
|
<------+
|
'free_boxed_int': event 17
|
| NN | wrapped_free (bi);
| | ^~~~~~~~~~~~~~~~~
| | |
| | (17) returning to 'free_boxed_int' from 'wrapped_free'
|
<------+
|
'test': events 18-19
|
| NN | free_boxed_int (obj);
| | ^~~~~~~~~~~~~~~~~~~~
| | |
| | (18) returning to 'test' from 'free_boxed_int'
| NN |
| NN | free_boxed_int (obj);
| | ~~~~~~~~~~~~~~~~~~~~
| | |
| | (19) passing freed pointer 'obj' in call to 'free_boxed_int' from 'test'
|
+--> 'free_boxed_int': events 20-21
|
| NN | free_boxed_int (boxed_int *bi)
| | ^~~~~~~~~~~~~~
| | |
| | (20) entry to 'free_boxed_int'
| NN | {
| NN | wrapped_free (bi);
| | ~~~~~~~~~~~~~~~~~
| | |
| | (21) passing freed pointer 'bi' in call to 'wrapped_free' from 'free_boxed_int'
|
+--> 'wrapped_free': events 22-23
|
| NN | void wrapped_free (void *ptr)
| | ^~~~~~~~~~~~
| | |
| | (22) entry to 'wrapped_free'
| NN | {
| NN | free (ptr);
| | ~~~~~~~~~~
| | |
| | (23) second 'free' here; first 'free' was at (16)
|
{ dg-end-multiline-output "" } */
/* TODO: the event describing the allocation is uninteresting and probably
should be purged. */
|
