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Fix potential memory access after free in lw_expr_simplify_go() Thanks to Erik Gavriluk (erik@bombfactory.com) for spotting a missing "else" when attempting to resolve a "special" reference. This could have led to access to memory that had already been freed if a "special" resolved to an expression that also referenced the same special (a circular reference). Whether that can actually happen is questionable but the check must have been added for a reason so it follows that it should be done correctly. This also brings the code in line with similar code resolving symbol references which makes a similar check.
author William Astle <lost@l-w.ca>
date Sat, 14 Mar 2015 14:06:13 -0600
parents 6eed14cccac9
children 221b5f58d8ad
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1 /*
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2 lwar.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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21 Implements the program startup code
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23 */
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <sys/stat.h>
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28 #include <sys/types.h>
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29 #include <unistd.h>
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30
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6eed14cccac9 Switched lwar to lw_cmdline and brought in lwlib
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31 #include <lw_alloc.h>
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32
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33 #define __lwar_c_seen__
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34 #include "lwar.h"
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36 typedef struct
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37 {
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38 FILE *f;
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39 } arhandle_real;
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40
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41 int debug_level = 0;
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42 int operation = 0;
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43 int nfiles = 0;
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44 char *archive_file = NULL;
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45 int mergeflag = 0;
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46
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47 char **files = NULL;
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48
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49 void add_file_name(char *fn)
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50 {
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51 files = lw_realloc(files, sizeof(char *) * (nfiles + 1));
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52 files[nfiles] = fn;
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53 nfiles++;
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54 }