[PATCH] cgroup: check the return value of kstrdup()

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 <redacted>
---
 kernel/cgroup/cgroup.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index ea08f01..47c7d58 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c

@@ -2228,6 +2228,9 @@ static int cpuset_init_fs_context(struct fs_context *fc)
 	struct cgroup_fs_context *ctx;
 	int err;
 
+	if (!agent)
+		return -ENOMEM;
+
 	err = cgroup_init_fs_context(fc);
 	if (err) {
 		kfree(agent);

--