Bug Summary

File:src/usr.bin/indent/args.c
Warning:line 205, column 6
Address of stack memory associated with local variable 'buf' is still referred to by the global variable 'param_start' upon returning to the caller. This will be a dangling reference

Annotated Source Code

Press '?' to see keyboard shortcuts

clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name args.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.bin/indent/obj -resource-dir /usr/local/lib/clang/13.0.0 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.bin/indent/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/usr.bin/indent/args.c
1/* $OpenBSD: args.c,v 1.18 2014/05/20 01:25:23 guenther Exp $ */
2
3/*
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California.
6 * Copyright (c) 1976 Board of Trustees of the University of Illinois.
7 * Copyright (c) 1985 Sun Microsystems, Inc.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35/*
36 * Argument scanning and profile reading code. Default parameters are set
37 * here as well.
38 */
39
40#include <stdio.h>
41#include <ctype.h>
42#include <stdlib.h>
43#include <string.h>
44#include <errno(*__errno()).h>
45#include "indent_globs.h"
46#include <err.h>
47
48/* profile types */
49#define PRO_SPECIAL1 1 /* special case */
50#define PRO_BOOL2 2 /* boolean */
51#define PRO_INT3 3 /* integer */
52#define PRO_FONT4 4 /* troff font */
53
54/* profile specials for booleans */
55#define ON1 1 /* turn it on */
56#define OFF0 0 /* turn it off */
57
58/* profile specials for specials */
59#define IGN1 1 /* ignore it */
60#define CLI2 2 /* case label indent (float) */
61#define STDIN3 3 /* use stdin */
62#define KEY4 4 /* type (keyword) */
63
64char *option_source = "?";
65
66/*
67 * N.B.: because of the way the table here is scanned, options whose names are
68 * substrings of other options must occur later; that is, with -lp vs -l, -lp
69 * must be first. Also, while (most) booleans occur more than once, the last
70 * default value is the one actually assigned.
71 */
72struct pro {
73 char *p_name; /* name, eg -bl, -cli */
74 int p_type; /* type (int, bool, special) */
75 int p_default; /* the default value (if int) */
76 int p_special; /* depends on type */
77 int *p_obj; /* the associated variable */
78} pro[] = {
79
80 { "T", PRO_SPECIAL1, 0, KEY4, 0 },
81 {"bacc", PRO_BOOL2, false0, ON1,
82 &blanklines_around_conditional_compilation },
83 {"badp", PRO_BOOL2, false0, ON1,
84 &blanklines_after_declarations_at_proctop },
85 {"bad", PRO_BOOL2, false0, ON1, &blanklines_after_declarations },
86 {"bap", PRO_BOOL2, false0, ON1, &blanklines_after_procs },
87 {"bbb", PRO_BOOL2, false0, ON1, &blanklines_before_blockcomments },
88 {"bc", PRO_BOOL2, true1, OFF0, &ps.leave_comma },
89 {"bl", PRO_BOOL2, true1, OFF0, &btype_2 },
90 {"br", PRO_BOOL2, true1, ON1, &btype_2 },
91 {"bs", PRO_BOOL2, false0, ON1, &Bill_Shannon },
92 {"cdb", PRO_BOOL2, true1, ON1, &comment_delimiter_on_blankline },
93 {"cd", PRO_INT3, 0, 0, &ps.decl_com_ind },
94 {"ce", PRO_BOOL2, true1, ON1, &cuddle_else },
95 {"ci", PRO_INT3, 0, 0, &continuation_indent },
96 {"cli", PRO_SPECIAL1, 0, CLI2, 0 },
97 {"c", PRO_INT3, 33, 0, &ps.com_ind },
98 {"di", PRO_INT3, 16, 0, &ps.decl_indent },
99 {"dj", PRO_BOOL2, false0, ON1, &ps.ljust_decl },
100 {"d", PRO_INT3, 0, 0, &ps.unindent_displace },
101 {"eei", PRO_BOOL2, false0, ON1, &extra_expression_indent },
102 {"ei", PRO_BOOL2, true1, ON1, &ps.else_if },
103 {"fbc", PRO_FONT4, 0, 0, (int *) &blkcomf },
104 {"fbx", PRO_FONT4, 0, 0, (int *) &boxcomf },
105 {"fb", PRO_FONT4, 0, 0, (int *) &bodyf },
106 {"fc1", PRO_BOOL2, true1, ON1, &format_col1_comments },
107 {"fc", PRO_FONT4, 0, 0, (int *) &scomf },
108 {"fk", PRO_FONT4, 0, 0, (int *) &keywordf },
109 {"fs", PRO_FONT4, 0, 0, (int *) &stringf },
110 {"ip", PRO_BOOL2, true1, ON1, &ps.indent_parameters },
111 {"i", PRO_INT3, 8, 0, &ps.ind_size },
112 {"lc", PRO_INT3, 0, 0, &block_comment_max_col },
113 {"lp", PRO_BOOL2, true1, ON1, &lineup_to_parens },
114 {"l", PRO_INT3, 78, 0, &max_col },
115 {"nbacc", PRO_BOOL2, false0, OFF0,
116 &blanklines_around_conditional_compilation },
117 {"nbadp", PRO_BOOL2, false0, OFF0,
118 &blanklines_after_declarations_at_proctop },
119 {"nbad", PRO_BOOL2, false0, OFF0, &blanklines_after_declarations },
120 {"nbap", PRO_BOOL2, false0, OFF0, &blanklines_after_procs },
121 {"nbbb", PRO_BOOL2, false0, OFF0, &blanklines_before_blockcomments },
122 {"nbc", PRO_BOOL2, true1, ON1, &ps.leave_comma },
123 {"nbs", PRO_BOOL2, false0, OFF0, &Bill_Shannon },
124 {"ncdb", PRO_BOOL2, true1, OFF0, &comment_delimiter_on_blankline },
125 {"nce", PRO_BOOL2, true1, OFF0, &cuddle_else },
126 {"ndj", PRO_BOOL2, false0, OFF0, &ps.ljust_decl },
127 {"neei", PRO_BOOL2, false0, OFF0, &extra_expression_indent },
128 {"nei", PRO_BOOL2, true1, OFF0, &ps.else_if },
129 {"nfc1", PRO_BOOL2, true1, OFF0, &format_col1_comments },
130 {"nip", PRO_BOOL2, true1, OFF0, &ps.indent_parameters },
131 {"nlp", PRO_BOOL2, true1, OFF0, &lineup_to_parens },
132 {"npcs", PRO_BOOL2, false0, OFF0, &proc_calls_space },
133 {"npro", PRO_SPECIAL1, 0, IGN1, 0 },
134 {"npsl", PRO_BOOL2, true1, OFF0, &procnames_start_line },
135 {"nps", PRO_BOOL2, false0, OFF0, &pointer_as_binop },
136 {"nsc", PRO_BOOL2, true1, OFF0, &star_comment_cont },
137 {"nsob", PRO_BOOL2, false0, OFF0, &swallow_optional_blanklines },
138 {"nut", PRO_BOOL2, true1, OFF0, &use_tabs},
139 {"nv", PRO_BOOL2, false0, OFF0, &verbose },
140 {"pcs", PRO_BOOL2, false0, ON1, &proc_calls_space },
141 {"psl", PRO_BOOL2, true1, ON1, &procnames_start_line },
142 {"ps", PRO_BOOL2, false0, ON1, &pointer_as_binop },
143 {"sc", PRO_BOOL2, true1, ON1, &star_comment_cont },
144 {"sob", PRO_BOOL2, false0, ON1, &swallow_optional_blanklines },
145 {"st", PRO_SPECIAL1, 0, STDIN3, 0 },
146 {"troff", PRO_BOOL2, false0, ON1, &troff },
147 {"ut", PRO_BOOL2, true1, ON1, &use_tabs},
148 {"v", PRO_BOOL2, false0, ON1, &verbose },
149 /* whew! */
150 { 0, 0, 0, 0, 0 }
151};
152
153void scan_profile(FILE *);
154void set_option(char *);
155
156/*
157 * set_profile reads $HOME/.indent.pro and ./.indent.pro and handles arguments
158 * given in these files.
159 */
160void
161set_profile(void)
162{
163 FILE *f;
164 char fname[BUFSIZ1024];
165 char *home;
166 static char prof[] = ".indent.pro";
167
168 home = getenv("HOME");
169 if (home != NULL((void *)0) && *home != '\0') {
1
Assuming 'home' is not equal to NULL
→
2
←
Assuming the condition is true
→
3
←
Taking true branch
→
170 if (snprintf(fname, sizeof fname, "%s/%s", home, prof) >= sizeof fname) {
4
←
Assuming the condition is false
→
5
←
Taking false branch
→
171 warnc(ENAMETOOLONG63, "%s/%s", home, prof);
172 return;
173 }
174 if ((f = fopen(option_source = fname, "r")) != NULL((void *)0)) {
6
←
Assuming the condition is true
→
7
←
Taking true branch
→
175 scan_profile(f);
8
←
Calling 'scan_profile'
→
176 (void) fclose(f);
177 }
178 }
179 if ((f = fopen(option_source = prof, "r")) != NULL((void *)0)) {
180 scan_profile(f);
181 (void) fclose(f);
182 }
183 option_source = "Command line";
184}
185
186void
187scan_profile(FILE *f)
188{
189 int i;
190 char *p;
191 char buf[BUFSIZ1024];
192
193 while (1) {
9
←
Loop condition is true. Entering loop body
→
20
←
Loop condition is true. Entering loop body
→
194 for (p = buf;
14
←
Loop condition is true. Entering loop body
→
195 (i = getc(f)(!__isthreaded ? (--(f)->_r < 0 ? __srget(f) : (int)(*(
f)->_p++)) : (getc)(f))) != EOF(-1) && (*p = i) > ' ' && p + 1 - buf < BUFSIZ1024;
10
←
Assuming '__isthreaded' is not equal to 0
→
11
←
'?' condition is false
→
12
←
Assuming the condition is true
→
13
←
Assuming the condition is true
→
15
←
'?' condition is false
→
16
←
Assuming the condition is false
→
21
←
'?' condition is false
→
22
←
Assuming the condition is false
→
196 ++p)
197 ;
198 if (p
16.1
'p' is not equal to 'buf'
22.1
'p' is equal to 'buf'
 != buf) {
17
←
Taking true branch
→
23
←
Taking false branch
→
199 *p = 0;
200 if (verbose)
18
←
Assuming 'verbose' is 0
→
19
←
Taking false branch
→
201 printf("profile: %s\n", buf);
202 set_option(buf);
203 }
204 else if (i == EOF(-1))
24
←
Taking true branch
→
205 return;
25
←
Address of stack memory associated with local variable 'buf' is still referred to by the global variable 'param_start' upon returning to the caller. This will be a dangling reference
206 }
207}
208
209char *param_start;
210
211int
212eqin(char *s1, char *s2)
213{
214 while (*s1) {
215 if (*s1++ != *s2++)
216 return (false0);
217 }
218 param_start = s2;
219 return (true1);
220}
221
222/*
223 * Set the defaults.
224 */
225void
226set_defaults(void)
227{
228 struct pro *p;
229
230 /*
231 * Because ps.case_indent is a float, we can't initialize it from the
232 * table:
233 */
234 ps.case_indent = 0.0; /* -cli0.0 */
235 for (p = pro; p->p_name; p++)
236 if (p->p_type != PRO_SPECIAL1 && p->p_type != PRO_FONT4)
237 *p->p_obj = p->p_default;
238}
239
240void
241set_option(char *arg)
242{
243 struct pro *p;
244
245 arg++; /* ignore leading "-" */
246 for (p = pro; p->p_name; p++)
247 if (*p->p_name == *arg && eqin(p->p_name, arg))
248 goto found;
249 errx(1, "%s: unknown parameter \"%s\"", option_source, arg - 1);
250found:
251 switch (p->p_type) {
252
253 case PRO_SPECIAL1:
254 switch (p->p_special) {
255
256 case IGN1:
257 break;
258
259 case CLI2:
260 if (*param_start == 0)
261 goto need_param;
262 ps.case_indent = atof(param_start);
263 break;
264
265 case STDIN3:
266 if (input == 0)
267 input = stdin(&__sF[0]);
268 if (output == 0)
269 output = stdout(&__sF[1]);
270 break;
271
272 case KEY4:
273 if (*param_start == 0)
274 goto need_param;
275 {
276 char *str;
277 if ((str = strdup(param_start)) == NULL((void *)0))
278 err(1, NULL((void *)0));
279 addkey(str, 4);
280 }
281 break;
282
283 default:
284 errx(1, "set_option: internal error: p_special %d", p->p_special);
285 }
286 break;
287
288 case PRO_BOOL2:
289 if (p->p_special == OFF0)
290 *p->p_obj = false0;
291 else
292 *p->p_obj = true1;
293 break;
294
295 case PRO_INT3:
296 if (!isdigit((unsigned char)*param_start)) {
297 need_param:
298 errx(1, "%s: ``%s'' requires a parameter", option_source, arg - 1);
299 }
300 *p->p_obj = atoi(param_start);
301 if (*p->p_name == 'i' && *p->p_obj <= 0)
302 errx(1, "%s: ``%s must be greater of zero''",
303 option_source, arg - 1);
304 break;
305
306 case PRO_FONT4:
307 parsefont((struct fstate *) p->p_obj, param_start);
308 break;
309
310 default:
311 errx(1, "set_option: internal error: p_type %d", p->p_type);
312 }
313}