apparmor: fix an error code in __aa_create_ns()

We should return error pointers in this function.  Returning NULL
results in a NULL dereference in the caller.

Fixes: 9069eaf2844c ("apparmor: refactor prepare_ns() and make usable from different views")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>

diff --git a/security/apparmor/policy_ns.c b/security/apparmor/policy_ns.c
index b0f9dc3f765a9d7a19003ae2f3bd327b58df98a9..1a7cec5d9cac64f2ab2e29afca385dee2e1b04c6 100644 (file)
--- a/security/apparmor/policy_ns.c
+++ b/security/apparmor/policy_ns.c
@@ -255,7 +255,7 @@ static struct aa_ns *__aa_create_ns(struct aa_ns *parent, const char *name,
 
        ns = alloc_ns(parent->base.hname, name);
        if (!ns)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
        ns->level = parent->level + 1;
        mutex_lock_nested(&ns->lock, ns->level);
        error = __aafs_ns_mkdir(ns, ns_subns_dir(parent), name, dir);