From: Corbin McElhanney <corbin.mcelhanney@amd.com>
Date: Thu, 3 Aug 2017 18:29:42 -0400
Subject: drm/amd/display: Fix accessing freed memory
Git-commit: 5aa72db72ccc08c2d3d3e4b0a285bab932db5132
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Corbin McElhanney <corbin.mcelhanney@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1714,8 +1714,11 @@ void dc_update_planes_and_stream(struct
 	}
 
 	if (core_dc->current_context != context) {
-		dc_release_validate_context(core_dc->current_context);
+		struct validate_context *old = core_dc->current_context;
+
 		core_dc->current_context = context;
+		dc_release_validate_context(old);
+
 	}
 	return;