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From 77288e5827af2803f7957eff7e1c3f04b8245128 Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Fri, 21 Nov 2025 13:39:22 -0800
Subject: [PATCH] display: handle XFree86_VT property type of "None"
When a property name is known, but the property is not set on the given
window, the X server will respond with a property type of "None" and no
value. This fixes the code to handle that, instead of trying to read
the non-existent property value from past the end of the allocated reply.
Fixes: ca9006193 ("display: port GdmDisplay to xcb")
Closes: #1038
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
daemon/gdm-display.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index 54e054808..c51ce8d58 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -1864,7 +1864,8 @@ gdm_display_set_windowpath (GdmDisplay *self)
get_property_reply = xcb_get_property_reply (priv->xcb_connection, get_property_cookie, NULL);
- if (get_property_reply == NULL) {
+ if ((get_property_reply == NULL) ||
+ (get_property_reply->type == XCB_NONE)) {
g_debug ("no XFree86_VT property\n");
goto out;
}
--
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