net/packet: fix a race in packet_set_ring() and packet_notifier()

When packet_set_ring() releases po->bind_lock, another thread can
run packet_notifier() and process an NETDEV_UP event.

This race and the fix are both similar to that of commit 15fe076
("net/packet: fix a race in packet_bind() and packet_notifier()").

There too the packet_notifier NETDEV_UP event managed to run while a
po->bind_lock critical section had to be temporarily released. And
the fix was similarly to temporarily set po->num to zero to keep
the socket unhooked until the lock is retaken.

The po->bind_lock in packet_set_ring and packet_notifier precede the
introduction of git history.

Fixes: 1da177e ("Linux-2.6.12-rc2")
Cc:stable@vger.kernel.org
Signed-off-by: Quang Le<quanglex97@gmail.com>
Signed-off-by: Willem de Bruijn<willemb@google.com>
Link:https://patch.msgid.link/20250801175423.2970334-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski<kuba@kernel.org>

CVE-2025-38617
(cherry picked from commit 01d3c8417b9c1b884a8a981a3b886da556512f36)
Signed-off-by: Tim Whisonant<tim.whisonant@canonical.com>
Acked-by: Bethany Jamison <bethany.jamison@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: quanglex97

net/packet/af_packet.c

@@ -4564,10 +4564,10 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
 	spin_lock(&po->bind_lock);
 	was_running = packet_sock_flag(po, PACKET_SOCK_RUNNING);
 	num = po->num;
-	if (was_running) {
-		WRITE_ONCE(po->num, 0);
+	WRITE_ONCE(po->num, 0);
+	if (was_running)
 		__unregister_prot_hook(sk, false);
-	}
+
 	spin_unlock(&po->bind_lock);
 
 	synchronize_net();
@@ -4599,10 +4599,10 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
 	mutex_unlock(&po->pg_vec_lock);
 
 	spin_lock(&po->bind_lock);
-	if (was_running) {
-		WRITE_ONCE(po->num, num);
+	WRITE_ONCE(po->num, num);
+	if (was_running)
 		register_prot_hook(sk);
-	}
+
 	spin_unlock(&po->bind_lock);
 	if (pg_vec && (po->tp_version > TPACKET_V2)) {
 		/* Because we don't support block-based V3 on tx-ring */