From 7a6d2d41bd672f1fb21070210d9925ac38b90c5a Mon Sep 17 00:00:00 2001
From: "Enrico Weigelt, metux IT consult" <info@metux.net>
Date: Tue, 6 May 2025 17:02:39 +0200
Subject: [PATCH] Xext: shm: protect against possible NULL dereference
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| ../Xext/shm.c: In function ‘ShmExtensionInit’:
| ../Xext/shm.c:1534:29: warning: dereference of possibly-NULL ‘screen_priv’ [CWE-690] [-Wanalyzer-possible-null-dereference]
|  1534 |             if (!screen_priv->shmFuncs)
|       |                  ~~~~~~~~~~~^~~~~~~~~~

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
---
 Xext/shm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Xext/shm.c b/Xext/shm.c
index 446f9700a..e4cbf21dd 100644
--- a/Xext/shm.c
+++ b/Xext/shm.c
@@ -1536,6 +1536,8 @@ ShmExtensionInit(void)
         for (i = 0; i < screenInfo.numScreens; i++) {
             ShmScrPrivateRec *screen_priv =
                 ShmInitScreenPriv(screenInfo.screens[i]);
+            if (!screen_priv)
+                continue;
             if (!screen_priv->shmFuncs)
                 screen_priv->shmFuncs = &miFuncs;
             if (!screen_priv->shmFuncs->CreatePixmap)