File gnome-shell-CVE-2020-17489.patch of Package gnome-shell.16848

From 13137aad9db52223e8b62cecbd3456f4a7f66f04 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Mon, 27 Jul 2020 10:58:49 -0400
Subject: [PATCH] loginDialog: Reset auth prompt on vt switch before fade in

At the moment, if a user switches to the login screen vt,
the login screen fades in whatever was on screen prior, and
then does a reset.

It makes more sense to reset first, so we fade in what the
user is going to interact with instead of what they interacted
with before.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2997
---
 js/gdm/loginDialog.js | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Index: gnome-shell-3.34.5/js/gdm/loginDialog.js
===================================================================
--- gnome-shell-3.34.5.orig/js/gdm/loginDialog.js
+++ gnome-shell-3.34.5/js/gdm/loginDialog.js
@@ -921,16 +921,15 @@ var LoginDialog = GObject.registerClass(
         if (this.opacity == 255 && this._authPrompt.verificationStatus == AuthPrompt.AuthPromptStatus.NOT_VERIFYING)
             return;
 
+        if (this._authPrompt.verificationStatus !== AuthPrompt.AuthPromptStatus.NOT_VERIFYING)
+            this._authPrompt.reset();
+
         this._bindOpacity();
         this.ease({
             opacity: 255,
             duration: _FADE_ANIMATION_TIME,
             mode: Clutter.AnimationMode.EASE_OUT_QUAD,
-            onComplete: () => {
-                if (this._authPrompt.verificationStatus != AuthPrompt.AuthPromptStatus.NOT_VERIFYING)
-                    this._authPrompt.reset();
-                this._unbindOpacity();
-            }
+            onComplete: () => this._unbindOpacity(),
         });
     }
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