[PATCH] kernel/nsproxy.c: Fix memory leak of create_new_namespaces().

[wzt <wzt.wzt@gmail.com>]

copy_pid_ns() has allocted some memory via create_pid_namespace(), if copy_net_ns()
failed via create_new_namespaces(), it will cause memory leak. The copy_utsname() 
have the same problem.

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>

---
 kernel/nsproxy.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 9aeab4b..e2d18c9 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -99,14 +99,18 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
 	return new_nsp;
 
 out_net:
-	if (new_nsp->pid_ns)
+	if (new_nsp->pid_ns) {
 		put_pid_ns(new_nsp->pid_ns);
+		free_pid_ns(&new_nsp->pid_ns->kfre);
+	}
 out_pid:
 	if (new_nsp->ipc_ns)
 		put_ipc_ns(new_nsp->ipc_ns);
 out_ipc:
-	if (new_nsp->uts_ns)
+	if (new_nsp->uts_ns) {
 		put_uts_ns(new_nsp->uts_ns);
+		free_uts_ns(&new_nsp->pid_ns->kfref);
+	}
 out_uts:
 	if (new_nsp->mnt_ns)
 		put_mnt_ns(new_nsp->mnt_ns);
-- 
1.7.4.1