12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18 /*
19 * This file is sort of like check_dereferences_param.c. In theory the one
20 * difference should be that the param is NULL it should still be counted as a
21 * free. But for now I don't handle that case.
22 */
23
24 #include "smatch.h"
25 #include "smatch_extra.h"
26 #include "smatch_slist.h"
27
28 static int my_id;
29
30 STATE(freed);
31 STATE(ignore);
32 STATE(param);
33
34 static void set_ignore(struct sm_state *sm, struct expression *mod_expr)
35 {
36 set_state(my_id, sm->name, sm->sym, &ignore);
37 }
38
39 static void match_function_def(struct symbol *sym)
40 {
41 struct symbol *arg;
42 int i;
43
44 i = -1;
45 FOR_EACH_PTR(sym->ctype.base_type->arguments, arg) {
46 i++;
47 if (!arg->ident)
48 continue;
49 set_state(my_id, arg->ident->name, arg, ¶m);
50 } END_FOR_EACH_PTR(arg);
51 }
52
53 static void freed_variable(struct expression *expr)
54 {
55 struct sm_state *sm;
56
57 expr = strip_expr(expr);
58 if (get_param_num(expr) < 0)
59 return;
60
61 sm = get_sm_state_expr(my_id, expr);
62 if (sm && slist_has_state(sm->possible, &ignore))
63 return;
64 set_state_expr(my_id, expr, &freed);
65 }
66
67 static void match_free(const char *fn, struct expression *expr, void *param)
68 {
69 struct expression *arg;
70
71 arg = get_argument_from_call_expr(expr->args, PTR_INT(param));
72 if (!arg)
94 param = get_param_num_from_sym(sm->sym);
95 if (param < 0)
96 continue;
97 param_name = get_param_name(sm);
98 if (!param_name)
99 continue;
100 sql_insert_return_implies(PARAM_FREED, param, param_name, "1");
101 } END_FOR_EACH_SM(sm);
102
103 }
104
105 void check_frees_param(int id)
106 {
107 my_id = id;
108
109 if (option_project == PROJ_KERNEL) {
110 /* The kernel uses check_frees_param_strict.c */
111 return;
112 }
113
114 add_hook(&match_function_def, FUNC_DEF_HOOK);
115
116 add_function_hook("free", &match_free, INT_PTR(0));
117
118 select_return_implies_hook(PARAM_FREED, &set_param_freed);
119 add_modification_hook(my_id, &set_ignore);
120
121 all_return_states_hook(&process_states);
122 }
|
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18 /*
19 * This file is sort of like check_dereferences_param.c. In theory the one
20 * difference should be that the param is NULL it should still be counted as a
21 * free. But for now I don't handle that case.
22 */
23
24 #include "smatch.h"
25 #include "smatch_extra.h"
26 #include "smatch_slist.h"
27
28 static int my_id;
29
30 STATE(freed);
31 STATE(ignore);
32
33 static void set_ignore(struct sm_state *sm, struct expression *mod_expr)
34 {
35 set_state(my_id, sm->name, sm->sym, &ignore);
36 }
37
38 static void freed_variable(struct expression *expr)
39 {
40 struct sm_state *sm;
41
42 expr = strip_expr(expr);
43 if (get_param_num(expr) < 0)
44 return;
45
46 sm = get_sm_state_expr(my_id, expr);
47 if (sm && slist_has_state(sm->possible, &ignore))
48 return;
49 set_state_expr(my_id, expr, &freed);
50 }
51
52 static void match_free(const char *fn, struct expression *expr, void *param)
53 {
54 struct expression *arg;
55
56 arg = get_argument_from_call_expr(expr->args, PTR_INT(param));
57 if (!arg)
79 param = get_param_num_from_sym(sm->sym);
80 if (param < 0)
81 continue;
82 param_name = get_param_name(sm);
83 if (!param_name)
84 continue;
85 sql_insert_return_implies(PARAM_FREED, param, param_name, "1");
86 } END_FOR_EACH_SM(sm);
87
88 }
89
90 void check_frees_param(int id)
91 {
92 my_id = id;
93
94 if (option_project == PROJ_KERNEL) {
95 /* The kernel uses check_frees_param_strict.c */
96 return;
97 }
98
99 add_function_hook("free", &match_free, INT_PTR(0));
100
101 select_return_implies_hook(PARAM_FREED, &set_param_freed);
102 add_modification_hook(my_id, &set_ignore);
103
104 all_return_states_hook(&process_states);
105 }
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