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

[Xiaoke Wang]

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>
---
 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);
--