bareudp: Use rtnl_dereference() in bareudp_sock_release().

kernel test robot reported sparse warning in bareudp_sock_release():

  drivers/net/bareudp.c:288:12: warning: incorrect type in assignment (different address spaces)
  drivers/net/bareudp.c:288:12:    expected struct sock *sk
  drivers/net/bareudp.c:288:12:    got struct sock [noderef] __rcu *sk

The warning is not new and exists since the initial bareudp commit
571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling
different protocols like MPLS, IP, NSH etc.").

Let's use rtnl_dereference().

Note that bareudp_sock_release() is called from bareudp_stop()
under RTNL, so there is no real issue even without the helper.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202605062359.e3gOfZCr-lkp@intel.com/
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260518050726.318824-6-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c
index bfcecdcffe670fbc8e4e601f0940f6cb777c89cd..5ef841c8552697cea2f852af05866f3ad3c5898e 100644 (file)
--- a/drivers/net/bareudp.c
+++ b/drivers/net/bareudp.c
@@ -285,7 +285,7 @@ static void bareudp_sock_release(struct bareudp_dev *bareudp)
 {
        struct sock *sk;
 
-       sk = bareudp->sk;
+       sk = rtnl_dereference(bareudp->sk);
        rcu_assign_pointer(bareudp->sk, NULL);
        udp_tunnel_sock_release(sk);
 }