1 /* 2 * Copyright (C) 2010 Dan Carpenter. 3 * 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. 8 * 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. 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 #include "smatch.h" 19 #include "smatch_slist.h" 20 21 STATE(no_unmap); 22 23 extern int check_assigned_expr_id; 24 static int my_id; 25 26 static void check_assignment(void *data) 27 { 28 struct expression *expr = (struct expression *)data; 29 char *fn; 30 31 if (!expr) 32 return; 33 if (expr->type != EXPR_CALL) 34 return; 35 fn = expr_to_var(expr->fn); 36 if (!fn) 37 return; 38 if (!strcmp(fn, "kmap")) 39 sm_warning("passing the wrong variable to kunmap()"); 40 free_string(fn); 41 } 42 43 static void match_kmap_atomic(const char *fn, struct expression *expr, void *data) 44 { 45 struct expression *arg; 46 47 arg = get_argument_from_call_expr(expr->args, 0); 48 set_state_expr(my_id, arg, &no_unmap); 49 } 50 51 static void match_kunmap_atomic(const char *fn, struct expression *expr, void *data) 52 { 53 struct expression *arg; 54 struct sm_state *sm; 55 56 arg = get_argument_from_call_expr(expr->args, 0); 57 sm = get_sm_state_expr(my_id, arg); 58 if (!sm) 59 return; 60 if (slist_has_state(sm->possible, &no_unmap)) 61 sm_warning("passing the wrong variable to kmap_atomic()"); 62 } 63 64 static void match_kunmap(const char *fn, struct expression *expr, void *data) 65 { 66 struct expression *arg; 67 struct sm_state *sm; 68 struct sm_state *tmp; 69 70 arg = get_argument_from_call_expr(expr->args, 0); 71 sm = get_sm_state_expr(check_assigned_expr_id, arg); 72 if (!sm) 73 return; 74 FOR_EACH_PTR(sm->possible, tmp) { 75 check_assignment(tmp->state->data); 76 } END_FOR_EACH_PTR(tmp); 77 } 78 79 void check_kunmap(int id) 80 { 81 my_id = id; 82 if (option_project != PROJ_KERNEL) 83 return; 84 add_function_hook("kunmap", &match_kunmap, NULL); 85 add_function_hook("kmap_atomic", &match_kmap_atomic, NULL); 86 add_function_hook("kunmap_atomic", &match_kunmap_atomic, NULL); 87 } 88