xserver: Branch 'server-1.20-branch'

[GitLab Mirror]

 present/present_scmd.c |    6 ++++++
 1 file changed, 6 insertions(+)

New commits:
commit d2ce97bd02c16ae162c49f76a00fc858035f288e
Author: Błażej Szczygieł <spaz16 at wp.pl>
Date:   Thu Jan 13 00:47:27 2022 +0100

    present: Check for NULL to prevent crash
    
    Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1275
    Signed-off-by: Błażej Szczygieł <spaz16 at wp.pl>
    Tested-by: Aaron Plattner <aplattner at nvidia.com>
    (cherry picked from commit 22d5818851967408bb7c903cb345b7ca8766094c)

diff --git a/present/present_scmd.c b/present/present_scmd.c
index 3c68e690b..11391adbb 100644
--- a/present/present_scmd.c
+++ b/present/present_scmd.c
@@ -168,6 +168,9 @@ present_scmd_get_crtc(present_screen_priv_ptr screen_priv, WindowPtr window)
     if (!screen_priv->info)
         return NULL;
 
+    if (!screen_priv->info->get_crtc)
+        return NULL;
+
     return (*screen_priv->info->get_crtc)(window);
 }
 
@@ -206,6 +209,9 @@ present_flush(WindowPtr window)
     if (!screen_priv->info)
         return;
 
+    if (!screen_priv->info->flush)
+        return;
+
     (*screen_priv->info->flush) (window);
 }