From 87abff77880da827b8c9acb37e241999183b406f Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king@canonical.com>
Date: Tue, 23 Jul 2019 15:23:12 +0100
Subject: drm/amd/display: fix a missing null check on a failed kzalloc
Git-commit: 87abff77880da827b8c9acb37e241999183b406f
Patch-mainline: v5.4-rc1
References: bsc#1152489

Currently the allocation of config may fail and a null pointer
dereference on config can occur.  Fix this by added a null
check on a failed allocation of config.

Addresses-Coverity: ("Dereference null return")
Fixes: c2cd9d04ecf0 ("drm/amd/display: Hook up calls to do stereo mux and dig programming to stereo control interface")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 94f126d2331c..252b621d93a9 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1259,6 +1259,8 @@ bool dc_set_generic_gpio_for_stereo(bool enable,
 	struct gpio_generic_mux_config *config = kzalloc(sizeof(struct gpio_generic_mux_config),
 			   GFP_KERNEL);
 
+	if (!config)
+		return false;
 	pin_info = dal_gpio_get_generic_pin_info(gpio_service, GPIO_ID_GENERIC, 0);
 
 	if (pin_info.mask == 0xFFFFFFFF || pin_info.offset == 0xFFFFFFFF) {
-- 
2.28.0