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From 24a7470d5d199476c2ecc66499c900cfb08ef70b Mon Sep 17 00:00:00 2001
From: Vitaly Prosyak <vitaly.prosyak@amd.com>
Date: Thu, 17 Dec 2015 16:25:57 -0500
Subject: [PATCH 0638/1110] drm/amd/dal: Fix NULL pointer derefference on set
 mode

The preferreed mode could be zero

Signed-off-by: Jordan Lazare <Jordan.Lazare@amd.com>
Acked-by: Jordan Lazare <Jordan.Lazare@amd.com>
---
 drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_types.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_types.c b/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_types.c
index 50bd964..bbadc59 100644
--- a/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_types.c
+++ b/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_types.c
@@ -893,6 +893,10 @@ static struct dc_target *create_target_for_sink(
 				&aconnector->base.modes,
 				struct drm_display_mode,
 				head);
+	if (NULL == preferred_mode) {
+		DRM_ERROR("No preferred mode found\n");
+		goto stream_create_fail;
+	}
 
 	decide_crtc_timing_for_drm_display_mode(
 			&mode, preferred_mode,
-- 
2.7.4