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 20 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math) 21 { 22 struct expression *call; 23 struct symbol *left_type, *right_type; 24 int bytes; 25 sval_t sval; 26 char *str; 27 28 if (expr->type != EXPR_ASSIGNMENT) 29 return; 30 right_type = get_pointer_type(expr->right); 31 if (!right_type || type_bits(right_type) != -1) 32 return; 33 34 call = strip_expr(expr->right); 35 left_type = get_pointer_type(expr->left); 36 37 if (!parse_call_math(call, math, &sval) || sval.value == 0) 38 return; 39 if (!left_type) 40 return; 41 bytes = type_bytes(left_type); 42 if (bytes <= 0) 43 return; 44 if (sval.uvalue >= bytes) 45 return; 46 47 str = expr_to_str(expr->left); 48 sm_error("not allocating enough for = '%s' %d vs %s", str, bytes, sval_to_str(sval)); 49 free_string(str); 50 } 51 52 void check_allocating_enough_data(int id) 53 { 54 select_return_states_hook(BUF_SIZE, &db_returns_buf_size); 55 } 56