mptcp: Call dst_release() in mptcp_active_enable().

[ Upstream commit 108a86c ]

mptcp_active_enable() calls sk_dst_get(), which returns dst with its
refcount bumped, but forgot dst_release().

Let's add missing dst_release().

Cc: stable@vger.kernel.org
Fixes: 27069e7 ("mptcp: disable active MPTCP in case of blackhole")
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250916214758.650211-7-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 833d431 ("mptcp: reset blackhole on success with non-loopback ifaces")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: q2ven

net/mptcp/ctrl.c

@@ -385,6 +385,8 @@ void mptcp_active_enable(struct sock *sk)
 
 		if (dst && dst->dev && (dst->dev->flags & IFF_LOOPBACK))
 			atomic_set(&pernet->active_disable_times, 0);
+
+		dst_release(dst);
 	}
 }