[PATCH 4.19 070/196] drm/gma500: fix null pointer dereference in psb_intel_lvds_get_modes

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ma Ke <make24@xxxxxxxxxxx>

commit 2df7aac81070987b0f052985856aa325a38debf6 upstream.

In psb_intel_lvds_get_modes(), the return value of drm_mode_duplicate() is
assigned to mode, which will lead to a possible NULL pointer dereference
on failure of drm_mode_duplicate(). Add a check to avoid npd.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 89c78134cc54 ("gma500: Add Poulsbo support")
Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240709092011.3204970-1-make24@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/gma500/psb_intel_lvds.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/gma500/psb_intel_lvds.c
+++ b/drivers/gpu/drm/gma500/psb_intel_lvds.c
@@ -519,6 +519,9 @@ static int psb_intel_lvds_get_modes(stru
 	if (mode_dev->panel_fixed_mode != NULL) {
 		struct drm_display_mode *mode =
 		    drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
+		if (!mode)
+			return 0;
+
 		drm_mode_probed_add(connector, mode);
 		return 1;
 	}






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