--- a/greeter/greet.c Fri Feb 13 12:22:48 2015

+++ b/greeter/greet.c Fri Feb 13 12:23:57 2015

@@ -347,6 +347,8 @@

XSetAccessControl (dpy, DisableAccess);

}

XtDestroyWidget (toplevel);

+ toplevel = NULL;

+ login = NULL;

ClearCloseOnFork (XConnectionNumber (dpy));

XCloseDisplay (dpy);

Debug ("Greet connection closed\n");

@@ -736,6 +738,11 @@

m = (struct pam_message *)*msg;

r = *response;

+ if (login == NULL) {

+ status = PAM_CONV_ERR;

+ goto pam_error;

+ }

+

for (i = 0; i < num_msg; i++ , m++ , r++) {

char *username;

int promptId = 0;