function_hooks: fix a type issue (affects ranged function hooks)
[smatch.git] / check_frees_argument.c
blob5b4d57c997a81ad9a5705e623730f3f8fd2b8e31
1 /*
2 * Copyright (C) 2009 Dan Carpenter.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
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
18 /*
19 * This script is for finding functions like hcd_buffer_free() which free
20 * their arguments. After running it, add those functions to check_memory.c
23 #include "smatch.h"
24 #include "smatch_slist.h"
26 static int my_id;
28 STATE(freed);
30 static struct symbol *this_func;
31 static struct tracker_list *freed_args = NULL;
33 static void match_function_def(struct symbol *sym)
35 this_func = sym;
38 static int is_arg(char *name, struct symbol *sym)
40 struct symbol *arg;
41 const char *arg_name;
43 FOR_EACH_PTR(this_func->ctype.base_type->arguments, arg) {
44 arg_name = (arg->ident?arg->ident->name:"-");
45 if (sym == arg && !strcmp(name, arg_name))
46 return 1;
47 } END_FOR_EACH_PTR(arg);
48 return 0;
51 static void match_kfree(const char *fn, struct expression *expr, void *info)
53 struct expression *tmp;
54 struct symbol *sym;
55 char *name;
57 tmp = get_argument_from_call_expr(expr->args, 0);
58 tmp = strip_expr(tmp);
59 name = expr_to_var_sym(tmp, &sym);
60 if (is_arg(name, sym)) {
61 set_state(my_id, name, sym, &freed);
63 free_string(name);
66 static int return_count = 0;
67 static void match_return(struct expression *ret_value)
69 struct stree *stree;
70 struct sm_state *tmp;
71 struct tracker *tracker;
73 if (__inline_fn)
74 return;
76 if (!return_count) {
77 stree = __get_cur_stree();
78 FOR_EACH_MY_SM(my_id, stree, tmp) {
79 if (tmp->state == &freed)
80 add_tracker(&freed_args, my_id, tmp->name,
81 tmp->sym);
82 } END_FOR_EACH_SM(tmp);
83 } else {
84 FOR_EACH_PTR(freed_args, tracker) {
85 tmp = get_sm_state(my_id, tracker->name, tracker->sym);
86 if (tmp && tmp->state != &freed)
87 del_tracker(&freed_args, my_id, tracker->name,
88 tracker->sym);
89 } END_FOR_EACH_PTR(tracker);
93 static void print_arg(struct symbol *sym)
95 struct symbol *arg;
96 int i = 0;
98 FOR_EACH_PTR(this_func->ctype.base_type->arguments, arg) {
99 if (sym == arg) {
100 sm_info("free_arg %s %d", get_function(), i);
101 return;
103 i++;
104 } END_FOR_EACH_PTR(arg);
107 static void match_end_func(struct symbol *sym)
109 if (__inline_fn)
110 return;
111 if (is_reachable())
112 match_return(NULL);
115 static void match_after_func(struct symbol *sym)
117 struct tracker *tracker;
119 if (__inline_fn)
120 return;
122 FOR_EACH_PTR(freed_args, tracker) {
123 print_arg(tracker->sym);
124 } END_FOR_EACH_PTR(tracker);
126 free_trackers_and_list(&freed_args);
127 return_count = 0;
130 void check_frees_argument(int id)
132 if (!option_info)
133 return;
135 my_id = id;
136 add_hook(&match_function_def, FUNC_DEF_HOOK);
137 if (option_project == PROJ_KERNEL)
138 add_function_hook("kfree", &match_kfree, NULL);
139 else
140 add_function_hook("free", &match_kfree, NULL);
141 add_hook(&match_return, RETURN_HOOK);
142 add_hook(&match_end_func, END_FUNC_HOOK);
143 add_hook(&match_after_func, AFTER_FUNC_HOOK);