linux-kernel - [PATCH v2] nfs: nfs4clinet: check the return value of kstrdup()

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Message-ID: <tencent_818AD07038A58DFF31107CE6BB5C498E3607@qq.com>
Date:   Fri, 17 Dec 2021 01:01:33 +0800
From:   xkernel.wang@...mail.com
To:     trond.myklebust@...merspace.com, anna.schumaker@...app.com
Cc:     linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v2] nfs: nfs4clinet: check the return value of kstrdup()

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

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>
---
Changelogs:
move the check under if block.
---
 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 af57332..ed06b68 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -1368,8 +1368,11 @@ 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);
--