Patch "drm/panel: fix a possible null pointer dereference" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/panel: fix a possible null pointer dereference

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-panel-fix-a-possible-null-pointer-dereference.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a8105359b1ac86ac3c93dab19b439ab9ee60b6da
Author: Ma Ke <make_ruc2021@xxxxxxx>
Date:   Sat Oct 7 11:31:05 2023 +0800

    drm/panel: fix a possible null pointer dereference
    
    [ Upstream commit 924e5814d1f84e6fa5cb19c6eceb69f066225229 ]
    
    In versatile_panel_get_modes(), the return value of drm_mode_duplicate()
    is assigned to mode, which will lead to a NULL pointer dereference
    on failure of drm_mode_duplicate(). Add a check to avoid npd.
    
    Signed-off-by: Ma Ke <make_ruc2021@xxxxxxx>
    Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20231007033105.3997998-1-make_ruc2021@xxxxxxx
    Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20231007033105.3997998-1-make_ruc2021@xxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/panel/panel-arm-versatile.c b/drivers/gpu/drm/panel/panel-arm-versatile.c
index abb0788843c60..503ecea72c5ea 100644
--- a/drivers/gpu/drm/panel/panel-arm-versatile.c
+++ b/drivers/gpu/drm/panel/panel-arm-versatile.c
@@ -267,6 +267,8 @@ static int versatile_panel_get_modes(struct drm_panel *panel,
 	connector->display_info.bus_flags = vpanel->panel_type->bus_flags;
 
 	mode = drm_mode_duplicate(connector->dev, &vpanel->panel_type->mode);
+	if (!mode)
+		return -ENOMEM;
 	drm_mode_set_name(mode);
 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 



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