From: Mat Martineau mathew.j.martineau@linux.intel.com
From: Matthieu Baerts matthieu.baerts@tessares.net
commit d3295fee3c756ece33ac0d935e172e68c0a4161b upstream.
Before, only the destructor from TCP request sock in IPv4 was called even if the subflow was IPv6.
It is important to use the right destructor to avoid memory leaks with some advanced IPv6 features, e.g. when the request socks contain specific IPv6 options.
Fixes: 79c0949e9a09 ("mptcp: Add key generation and token tree") Reviewed-by: Mat Martineau mathew.j.martineau@linux.intel.com Cc: stable@vger.kernel.org # 5.10 Signed-off-by: Matthieu Baerts matthieu.baerts@tessares.net Signed-off-by: Mat Martineau mathew.j.martineau@linux.intel.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/mptcp/subflow.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-)
--- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -40,7 +40,6 @@ static void subflow_req_destructor(struc sock_put((struct sock *)subflow_req->msk);
mptcp_token_destroy_request(req); - tcp_request_sock_ops.destructor(req); }
static void subflow_generate_hmac(u64 key1, u64 key2, u32 nonce1, u32 nonce2, @@ -380,6 +379,12 @@ drop: return 0; }
+static void subflow_v4_req_destructor(struct request_sock *req) +{ + subflow_req_destructor(req); + tcp_request_sock_ops.destructor(req); +} + #if IS_ENABLED(CONFIG_MPTCP_IPV6) static struct request_sock_ops mptcp_subflow_v6_request_sock_ops __ro_after_init; static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops __ro_after_init; @@ -410,6 +415,12 @@ drop: tcp_listendrop(sk); return 0; /* don't send reset */ } + +static void subflow_v6_req_destructor(struct request_sock *req) +{ + subflow_req_destructor(req); + tcp6_request_sock_ops.destructor(req); +} #endif
struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops, @@ -1401,8 +1412,6 @@ static int subflow_ops_init(struct reque if (!subflow_ops->slab) return -ENOMEM;
- subflow_ops->destructor = subflow_req_destructor; - return 0; }
@@ -1410,6 +1419,8 @@ void __init mptcp_subflow_init(void) { mptcp_subflow_v4_request_sock_ops = tcp_request_sock_ops; mptcp_subflow_v4_request_sock_ops.slab_name = "request_sock_subflow_v4"; + mptcp_subflow_v4_request_sock_ops.destructor = subflow_v4_req_destructor; + if (subflow_ops_init(&mptcp_subflow_v4_request_sock_ops) != 0) panic("MPTCP: failed to init subflow v4 request sock ops\n");
@@ -1431,6 +1442,8 @@ void __init mptcp_subflow_init(void)
mptcp_subflow_v6_request_sock_ops = tcp6_request_sock_ops; mptcp_subflow_v6_request_sock_ops.slab_name = "request_sock_subflow_v6"; + mptcp_subflow_v6_request_sock_ops.destructor = subflow_v6_req_destructor; + if (subflow_ops_init(&mptcp_subflow_v6_request_sock_ops) != 0) panic("MPTCP: failed to init subflow v6 request sock ops\n");