From a66bdf5d11b0ba8e473ef90ba7e0e6399b5fc825 Mon Sep 17 00:00:00 2001
From: Sughosh Ganu <sughosh.ganu@arm.com>
Date: Thu, 26 Apr 2018 15:46:49 +0530
Subject: [PATCH] EDAC, ghes: Add a null pointer check in
 ghes_edac_unregister()

Add a null check for ghes_pvt, before dereferencing it. The pointer
could still be null in case the return path is taken before initialising
ghes_pvt in the registration function.

Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Sughosh Ganu <sughosh.ganu@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>
Link: http://lkml.kernel.org/r/1524737809-24475-1-git-send-email-sughosh.ganu@arm.com
Signed-off-by: Borislav Petkov <bp@suse.de>
---
 drivers/edac/ghes_edac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index 7fdbfe871f5c..758744038d93 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -517,6 +517,9 @@ void ghes_edac_unregister(struct ghes *ghes)
 {
 	struct mem_ctl_info *mci;
 
+	if (!ghes_pvt)
+		return;
+
 	mci = ghes_pvt->mci;
 	edac_mc_del_mc(mci->pdev);
 	edac_mc_free(mci);