linux-kernel - [PATCH 4.19 039/243] dlm: fix possible call to kfree() for non-initialized pointer

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Message-Id: <20191211150341.825724832@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:03:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Denis V. Lunev" <den@...nvz.org>,
        David Teigland <teigland@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 039/243] dlm: fix possible call to kfree() for non-initialized pointer

From: Denis V. Lunev <den@...nvz.org>

[ Upstream commit 58a923adf4d9aca8bf7205985c9c8fc531c65d72 ]

Technically dlm_config_nodes() could return error and keep nodes
uninitialized. After that on the fail path of we'll call kfree()
for that uninitialized value.

The patch is simple - we should just initialize nodes with NULL.

Signed-off-by: Denis V. Lunev <den@...nvz.org>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/dlm/member.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index cad6d85911a80..0bc43b35d2c53 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -671,7 +671,7 @@ int dlm_ls_stop(struct dlm_ls *ls)
 int dlm_ls_start(struct dlm_ls *ls)
 {
 	struct dlm_recover *rv, *rv_old;
-	struct dlm_config_node *nodes;
+	struct dlm_config_node *nodes = NULL;
 	int error, count;
 
 	rv = kzalloc(sizeof(*rv), GFP_NOFS);
-- 
2.20.1