linux-kernel - [PATCH AUTOSEL 4.19 02/10] nfs: nfs4clinet: check the return value of kstrdup()

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Message-Id: <20220203203613.4165-2-sashal@kernel.org>
Date:   Thu,  3 Feb 2022 15:36:05 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiaoke Wang <xkernel.wang@...mail.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Sasha Levin <sashal@...nel.org>,
        trond.myklebust@...merspace.com, anna.schumaker@...app.com,
        linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 02/10] nfs: nfs4clinet: check the return value of kstrdup()

From: Xiaoke Wang <xkernel.wang@...mail.com>

[ Upstream commit fbd2057e5329d3502a27491190237b6be52a1cb6 ]

kstrdup() returns NULL when some internal memory errors happen, it is
better to check the return value of it so to catch the memory error in
time.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/nfs4client.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 43659326b5191..c97ec2fa0bbcd 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -1273,8 +1273,11 @@ int nfs4_update_server(struct nfs_server *server, const char *hostname,
 	}
 	nfs_put_client(clp);
 
-	if (server->nfs_client->cl_hostname == NULL)
+	if (server->nfs_client->cl_hostname == NULL) {
 		server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
+		if (server->nfs_client->cl_hostname == NULL)
+			return -ENOMEM;
+	}
 	nfs_server_insert_lists(server);
 
 	return nfs_probe_destination(server);
-- 
2.34.1