[PATCH -next] audit: let the caller of audit_get_sk() ensure that net is valid

[Gaosheng Cui <cuigaosheng1@huawei.com>]

The caller of audit_get_sk() must ensure that net is valid, otherwise
there will be null-prt-defer, for example, in the netlink_unicast().

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
---
 kernel/audit.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 9bc0b0301198..6a42a3801d01 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -285,16 +285,13 @@ static pid_t auditd_pid_vnr(void)
  * @net: the destination network namespace
  *
  * Description:
- * Returns the sock pointer if valid, NULL otherwise.  The caller must ensure
- * that a reference is held for the network namespace while the sock is in use.
+ * Returns the sock pointer. The caller must ensure than net is valid and
+ * a reference is held for the network namespace while the sock is in use.
  */
 static struct sock *audit_get_sk(const struct net *net)
 {
 	struct audit_net *aunet;
 
-	if (!net)
-		return NULL;
-
 	aunet = net_generic(net, audit_net_id);
 	return aunet->sk;
 }
-- 
2.25.1