[src/trunk]: src/usr.bin/xlint/lint1 Prevent crashing when options are NULL i...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f5406b71fb0c
branches:  trunk
changeset: 980820:f5406b71fb0c
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Feb 20 01:18:02 2021 +0000

description:
Prevent crashing when options are NULL in libc while linting
    src/lib/libc/posix1e/acl_from_text.c

diffstat:

 usr.bin/xlint/lint1/ckgetopt.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (37 lines):

diff -r 3df99b1128d0 -r f5406b71fb0c usr.bin/xlint/lint1/ckgetopt.c
--- a/usr.bin/xlint/lint1/ckgetopt.c    Fri Feb 19 23:25:26 2021 +0000
+++ b/usr.bin/xlint/lint1/ckgetopt.c    Sat Feb 20 01:18:02 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ckgetopt.c,v 1.2 2021/02/19 14:44:29 rillig Exp $ */
+/* $NetBSD: ckgetopt.c,v 1.3 2021/02/20 01:18:02 christos Exp $ */
 
 /*-
  * Copyright (c) 2021 The NetBSD Foundation, Inc.
@@ -35,7 +35,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: ckgetopt.c,v 1.2 2021/02/19 14:44:29 rillig Exp $");
+__RCSID("$NetBSD: ckgetopt.c,v 1.3 2021/02/20 01:18:02 christos Exp $");
 #endif
 
 #include <stdbool.h>
@@ -100,7 +100,7 @@
 static void
 check_unlisted_option(char opt)
 {
-       if (opt == '?')
+       if (opt == '?' || ck.options == NULL)
                return;
 
        const char *optptr = strchr(ck.options, opt);
@@ -116,6 +116,9 @@
 static void
 check_unhandled_option(void)
 {
+       if (ck.unhandled_options == NULL)
+               return;
+
        for (const char *opt = ck.unhandled_options; *opt != '\0'; opt++) {
                if (*opt == ' ' || *opt == ':')
                        continue;