user2netname expects a MAXNETNAMELEN + 1 buffer, so give it one

Found by gcc 13.2 on Solaris 11.4:

xhost.c: In function ‘change_host’:
xhost.c:522:18: warning: ‘user2netname’ accessing 256 bytes in a region of
 size 255 [-Wstringop-overflow=]
  522 |             if (!user2netname(username, pwd->pw_uid, domainname)) {
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
xhost.c:522:18: note: referencing argument 1 of type ‘char[256]’
In file included from /usr/include/rpc/rpc.h:35,
                 from xhost.c:98:
/usr/include/rpc/auth.h:316:12: note: in a call to function ‘user2netname’
  316 | extern int user2netname(char [MAXNETNAMELEN + 1], const uid_t, const char *);
      |            ^~~~~~~~~~~~

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/app/xhost/-/merge_requests/7>

1 files changed, 1 insertions, 1 deletions

diff --git a/xhost.c b/xhost.c
index 1c855ee..22304bd 100644
--- a/xhost.c
+++ b/xhost.c
@@ -506,7 +506,7 @@ change_host(Display *dpy, char *name, Bool add)
 	(cp = strchr(name, '@'))) {
         char *netname = name;
 #ifdef SECURE_RPC
-	static char username[MAXNETNAMELEN];
+	static char username[MAXNETNAMELEN + 1];
 
 	if (!cp[1]) {
 	    struct passwd *pwd;