1 /* 2 * Copyright (C) 2011 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 20 static int my_id; 21 22 static void check_size_not_zero(struct expression *expr) 23 { 24 sval_t sval; 25 26 if (expr->type != EXPR_VALUE) 27 return; 28 if (!get_value(expr, &sval)) 29 return; 30 if (sval.value != 0) 31 return; 32 sm_error("calling memset(x, y, 0);"); 33 } 34 35 static void check_size_not_ARRAY_SIZE(struct expression *expr) 36 { 37 char *name; 38 39 name = get_macro_name(expr->pos); 40 if (name && strcmp(name, "ARRAY_SIZE") == 0) 41 sm_warning("calling memset(x, y, ARRAY_SIZE());"); 42 } 43 44 static void match_memset(const char *fn, struct expression *expr, void *data) 45 { 46 struct expression *arg_expr; 47 48 arg_expr = get_argument_from_call_expr(expr->args, 2); 49 if (!arg_expr) 50 return; 51 check_size_not_zero(arg_expr); 52 check_size_not_ARRAY_SIZE(arg_expr); 53 } 54 55 void check_memset(int id) 56 { 57 my_id = id; 58 add_function_hook("memset", &match_memset, NULL); 59 add_function_hook("__builtin_memset", &match_memset, NULL); 60 } 61