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 27 if (expr->type != EXPR_ASSIGNMENT) 28 return; 29 right_type = get_pointer_type(expr->right); 30 if (!right_type || type_bits(right_type) != -1) 31 return; 32 33 call = strip_expr(expr->right); 34 left_type = get_pointer_type(expr->left); 35 36 if (!parse_call_math(call, math, &sval) || sval.value == 0) 37 return; 38 if (!left_type) 39 return; 40 bytes = type_bytes(left_type); 41 if (bytes <= 0) 42 return; 43 if (sval.uvalue >= bytes) 44 return; 45 sm_error("not allocating enough data %d vs %s", bytes, sval_to_str(sval)); 46 } 47 48 void check_allocating_enough_data(int id) 49 { 50 select_return_states_hook(BUF_SIZE, &db_returns_buf_size); 51 } 52