linux-kernel - [PATCH 4.4 48/56] cifs: Use kzfree() to zero out the password

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Message-Id: <20190919214801.891027905@linuxfoundation.org>
Date:   Fri, 20 Sep 2019 00:04:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 48/56] cifs: Use kzfree() to zero out the password

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 478228e57f81f6cb60798d54fc02a74ea7dd267e ]

It's safer to zero out the password so that it can never be disclosed.

Fixes: 0c219f5799c7 ("cifs: set domainName when a domain-key is used in multiuser")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/cifs/connect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 90e0c51ac0450..63108343124af 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2586,7 +2586,7 @@ cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
 			rc = -ENOMEM;
 			kfree(vol->username);
 			vol->username = NULL;
-			kfree(vol->password);
+			kzfree(vol->password);
 			vol->password = NULL;
 			goto out_key_put;
 		}
-- 
2.20.1