File gdm-fix-crash-when-using-Xvfb.patch of Package gdm.38857

From b7bbd224b0aef9d6c75c876153fdf778b5346fd9 Mon Sep 17 00:00:00 2001
From: Benjamin Berg <bberg@redhat.com>
Date: Fri, 21 Aug 2020 12:14:32 +0200
Subject: [PATCH 1/2] manager: Fix possible crash by initializing display

Some people insist on running sessions in ways where we cannot detect
them properly. In that case, we shouldn't find a display, but the
variable was not initialized and we could end up accessing random memory
resulting in a crash.

Fix it by adding the missing initializer.

Closes: #555
---
 daemon/gdm-manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index 907eca37..e1bc09b1 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -811,7 +811,7 @@ gdm_manager_handle_register_session (GdmDBusManager        *manager,
                                      GVariant              *details)
 {
         GdmManager      *self = GDM_MANAGER (manager);
-        GdmDisplay      *display;
+        GdmDisplay      *display = NULL;
         const char      *sender;
         GDBusConnection *connection;
 
-- 
2.30.0


From 84b4f871e3d8276a102285ac83d21ef11256d6c3 Mon Sep 17 00:00:00 2001
From: Benjamin Berg <bberg@redhat.com>
Date: Fri, 21 Aug 2020 12:15:47 +0200
Subject: [PATCH 2/2] manager: Always write out parameter

The get_display_and_details_for_bus_sender function does not return a
proper error value. Due to this, it makes sense to always write the out
parameters (though, I expect we have still more that we might need to
write).

This is just slightly safer, but the function probably isn't great as
is.
---
 daemon/gdm-manager.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index e1bc09b1..012be49d 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -576,10 +576,11 @@ get_display_and_details_for_bus_sender (GdmManager       *self,
                                           lookup_by_session_id,
                                           (gpointer) session_id);
 
+out:
         if (out_display != NULL) {
                 *out_display = display;
         }
-out:
+
         g_free (session_id);
 }
 
-- 
2.30.0