netdev - [PATCH net 2/2] net: Flush deferred skb free on socket destroy

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Date:   Mon, 17 Jan 2022 11:27:33 +0200
From:   Gal Pressman <gal@...dia.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Gal Pressman <gal@...dia.com>
Subject: [PATCH net 2/2] net: Flush deferred skb free on socket destroy

The cited Fixes patch moved to a deferred skb approach where the skbs
are not freed immediately under the socket lock.  Add a WARN_ON_ONCE()
to verify the deferred list is empty on socket destroy, and empty it to
prevent potential memory leaks.

Fixes: f35f821935d8 ("tcp: defer skb freeing after socket lock is released")
Signed-off-by: Gal Pressman <gal@...dia.com>
---
 net/core/sock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/sock.c b/net/core/sock.c
index f32ec08a0c37..4ff806d71921 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2049,6 +2049,9 @@ void sk_destruct(struct sock *sk)
 {
 	bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
 
+	WARN_ON_ONCE(!llist_empty(&sk->defer_list));
+	sk_defer_free_flush(sk);
+
 	if (rcu_access_pointer(sk->sk_reuseport_cb)) {
 		reuseport_detach_sock(sk);
 		use_call_rcu = true;
-- 
2.25.1