linux-kernel - [PATCH net 2/2] mptcp: use sock_kfree

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Message-Id: <20241104-net-mptcp-misc-6-12-v1-2-c13f2ff1656f@kernel.org>
Date: Mon, 04 Nov 2024 13:31:42 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>, 
 Geliang Tang <geliang@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Donald Hunter <donald.hunter@...il.com>, 
 Davide Caratti <dcaratti@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>, stable@...r.kernel.org, 
 Geliang Tang <geliang@...nel.org>
Subject: [PATCH net 2/2] mptcp: use sock_kfree_s instead of kfree

From: Geliang Tang <tanggeliang@...inos.cn>

The local address entries on userspace_pm_local_addr_list are allocated
by sock_kmalloc().

It's then required to use sock_kfree_s() instead of kfree() to free
these entries in order to adjust the allocated size on the sk side.

Fixes: 24430f8bf516 ("mptcp: add address into userspace pm list")
Cc: stable@...r.kernel.org
Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 net/mptcp/pm_userspace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 2cceded3a83a211ffa83f5511fa16f153b49e6bf..56dfea9862b7b24dd0eaa8bbedcf22a7f6829ccf 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -91,6 +91,7 @@ static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
 						struct mptcp_pm_addr_entry *addr)
 {
 	struct mptcp_pm_addr_entry *entry, *tmp;
+	struct sock *sk = (struct sock *)msk;

 	list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
 		if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
@@ -98,7 +99,7 @@ static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
 			 * be used multiple times (e.g. fullmesh mode).
 			 */
 			list_del_rcu(&entry->list);
-			kfree(entry);
+			sock_kfree_s(sk, entry, sizeof(*entry));
 			msk->pm.local_addr_used--;
 			return 0;
 		}

-- 
2.45.2