netdev - [PATCH 4.19 3/5] inet6: Remove inet6_destroy_sock() in sk->sk

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Date:   Thu, 20 Apr 2023 11:12:52 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <gregkh@...uxfoundation.org>, <stable@...r.kernel.org>,
        <davem@...emloft.net>, <kuznet@....inr.ac.ru>,
        <yoshfuji@...ux-ipv6.org>, <dsahern@...nel.org>, <kuba@...nel.org>,
        <kuniyu@...zon.com>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH 4.19 3/5] inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy().

From: Kuniyuki Iwashima <kuniyu@...zon.com>

commit b5fc29233d28be7a3322848ebe73ac327559cdb9 upstream.

After commit d38afeec26ed ("tcp/udp: Call inet6_destroy_sock()
in IPv6 sk->sk_destruct()."), we call inet6_destroy_sock() in
sk->sk_destruct() by setting inet6_sock_destruct() to it to make
sure we do not leak inet6-specific resources.

Now we can remove unnecessary inet6_destroy_sock() calls in
sk->sk_prot->destroy().

DCCP and SCTP have their own sk->sk_destruct() function, so we
change them separately in the following patches.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 net/ipv6/ping.c     | 6 ------
 net/ipv6/raw.c      | 2 --
 net/ipv6/tcp_ipv6.c | 8 +-------
 net/ipv6/udp.c      | 2 --
 net/l2tp/l2tp_ip6.c | 2 --
 5 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index 23ae01715e7b..5c9be8594483 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -27,11 +27,6 @@
 #include <linux/proc_fs.h>
 #include <net/ping.h>
 
-static void ping_v6_destroy(struct sock *sk)
-{
-	inet6_destroy_sock(sk);
-}
-
 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 				 int *addr_len)
@@ -175,7 +170,6 @@ struct proto pingv6_prot = {
 	.owner =	THIS_MODULE,
 	.init =		ping_init_sock,
 	.close =	ping_close,
-	.destroy =	ping_v6_destroy,
 	.connect =	ip6_datagram_connect_v6_only,
 	.disconnect =	__udp_disconnect,
 	.setsockopt =	ipv6_setsockopt,
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 44e9a240d607..8ed99732e24c 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1259,8 +1259,6 @@ static void raw6_destroy(struct sock *sk)
 	lock_sock(sk);
 	ip6_flush_pending_frames(sk);
 	release_sock(sk);
-
-	inet6_destroy_sock(sk);
 }
 
 static int rawv6_init_sk(struct sock *sk)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index f69c1b83403b..033cf81f3483 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1792,12 +1792,6 @@ static int tcp_v6_init_sock(struct sock *sk)
 	return 0;
 }
 
-static void tcp_v6_destroy_sock(struct sock *sk)
-{
-	tcp_v4_destroy_sock(sk);
-	inet6_destroy_sock(sk);
-}
-
 #ifdef CONFIG_PROC_FS
 /* Proc filesystem TCPv6 sock list dumping. */
 static void get_openreq6(struct seq_file *seq,
@@ -1990,7 +1984,7 @@ struct proto tcpv6_prot = {
 	.accept			= inet_csk_accept,
 	.ioctl			= tcp_ioctl,
 	.init			= tcp_v6_init_sock,
-	.destroy		= tcp_v6_destroy_sock,
+	.destroy		= tcp_v4_destroy_sock,
 	.shutdown		= tcp_shutdown,
 	.setsockopt		= tcp_setsockopt,
 	.getsockopt		= tcp_getsockopt,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 93c105d0a0c9..c9522a4fc949 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1501,8 +1501,6 @@ void udpv6_destroy_sock(struct sock *sk)
 		if (encap_destroy)
 			encap_destroy(sk);
 	}
-
-	inet6_destroy_sock(sk);
 }
 
 /*
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 9dae10d8880c..f3f0b4b7c386 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -272,8 +272,6 @@ static void l2tp_ip6_destroy_sock(struct sock *sk)
 
 	if (tunnel)
 		l2tp_tunnel_delete(tunnel);
-
-	inet6_destroy_sock(sk);
 }
 
 static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
-- 
2.25.1