[PATCH AUTOSEL 4.14 2/9] nfs: nfs4clinet: check the return value of kstrdup()

From: Sasha Levin
Date: Thu Feb 03 2022 - 15:43:11 EST


From: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>

[ 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@xxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 02b01b4025f6e..c7672c89b9673 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -1241,8 +1241,11 @@ 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