[PATCH] APPARMOR: Fix memory leak of apparmor_init()

[wzt.wzt@gmail.com]

set_init_cxt() allocted sizeof(struct aa_task_cxt) bytes for cxt, 
if register_security() failed, it will cause memory leak.

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

---
 security/apparmor/lsm.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index cf1de44..b7106f1 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -922,7 +922,7 @@ static int __init apparmor_init(void)
 	error = register_security(&apparmor_ops);
 	if (error) {
 		AA_ERROR("Unable to register AppArmor\n");
-		goto register_security_out;
+		goto set_init_cxt_out;
 	}
 
 	/* Report that AppArmor successfully initialized */
@@ -936,6 +936,9 @@ static int __init apparmor_init(void)
 
 	return error;
 
+set_init_cxt_out:
+	aa_free_task_context(current->real_cred->security);
+
 register_security_out:
 	aa_free_root_ns();
 
@@ -944,7 +947,6 @@ alloc_out:
 
 	apparmor_enabled = 0;
 	return error;
-
 }
 
 security_initcall(apparmor_init);
-- 
1.6.5.3