in get_real_dir_from_tilde(), fix segfault when dealing with directory

names that begin with "~", but that aren't users' home directories


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4072 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2007-04-16  David Lawrence Ramsey  <pooka109@gmail.com>
+
+	* files.c (get_real_dir_from_tilde): Fix segfault when dealing
+	with directory names that begin with "~", but that aren't users'
+	home directories. (DLR, found by Justin Fletcher)
+
 2007-04-11  Mike Frysinger  <vapier@gentoo.org>
 
 	* doc/syntax/asm.nanorc, doc/syntax/c.nanorc,

src/files.c

@@ -1979,7 +1979,7 @@ char *real_dir_from_tilde(const char *buf)
 
     if (buf[0] == '~') {
 	size_t i;
-	const char *tilde_dir;
+	const char *tilde_dir = NULL;
 
 	/* Figure out how much of the str we need to compare. */
 	for (i = 1; buf[i] != '/' && buf[i] != '\0'; i++)
@@ -1997,7 +1997,8 @@ char *real_dir_from_tilde(const char *buf)
 	    } while (userdata != NULL &&
 		strncmp(userdata->pw_name, buf + 1, i - 1) != 0);
 	    endpwent();
-	    tilde_dir = userdata->pw_dir;
+	    if (userdata != NULL)
+		tilde_dir = userdata->pw_dir;
 	}
 
 	if (tilde_dir != NULL) {