This is a note to let you know that I've just added the patch titled
mptcp: revert "mptcp: provide subflow aware release function"
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptcp-revert-mptcp-provide-subflow-aware-release-fun.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 76956661dc8e9bff9b82a10094c1ba2c2b8f5629
Author: Paolo Abeni <pabeni@xxxxxxxxxx>
Date: Thu Apr 1 18:57:45 2021 +0200
mptcp: revert "mptcp: provide subflow aware release function"
[ Upstream commit 0a3cc57978d1d1448312f8973bd84dca4a71433a ]
This change reverts commit ad98dd37051e ("mptcp: provide subflow aware
release function"). The latter introduced a deadlock spotted by
syzkaller and is not needed anymore after the previous commit.
Fixes: ad98dd37051e ("mptcp: provide subflow aware release function")
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Reviewed-by: Mat Martineau <mathew.j.martineau@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index de9f2509acbe..e337b35a368f 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -11,7 +11,6 @@
#include <linux/netdevice.h>
#include <linux/sched/signal.h>
#include <linux/atomic.h>
-#include <linux/igmp.h>
#include <net/sock.h>
#include <net/inet_common.h>
#include <net/inet_hashtables.h>
@@ -20,7 +19,6 @@
#include <net/tcp_states.h>
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
#include <net/transp_v6.h>
-#include <net/addrconf.h>
#endif
#include <net/mptcp.h>
#include <net/xfrm.h>
@@ -3424,34 +3422,10 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
return mask;
}
-static int mptcp_release(struct socket *sock)
-{
- struct mptcp_subflow_context *subflow;
- struct sock *sk = sock->sk;
- struct mptcp_sock *msk;
-
- if (!sk)
- return 0;
-
- lock_sock(sk);
-
- msk = mptcp_sk(sk);
-
- mptcp_for_each_subflow(msk, subflow) {
- struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
-
- ip_mc_drop_socket(ssk);
- }
-
- release_sock(sk);
-
- return inet_release(sock);
-}
-
static const struct proto_ops mptcp_stream_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
- .release = mptcp_release,
+ .release = inet_release,
.bind = mptcp_bind,
.connect = mptcp_stream_connect,
.socketpair = sock_no_socketpair,
@@ -3498,35 +3472,10 @@ void __init mptcp_proto_init(void)
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-static int mptcp6_release(struct socket *sock)
-{
- struct mptcp_subflow_context *subflow;
- struct mptcp_sock *msk;
- struct sock *sk = sock->sk;
-
- if (!sk)
- return 0;
-
- lock_sock(sk);
-
- msk = mptcp_sk(sk);
-
- mptcp_for_each_subflow(msk, subflow) {
- struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
-
- ip_mc_drop_socket(ssk);
- ipv6_sock_mc_close(ssk);
- ipv6_sock_ac_close(ssk);
- }
-
- release_sock(sk);
- return inet6_release(sock);
-}
-
static const struct proto_ops mptcp_v6_stream_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
- .release = mptcp6_release,
+ .release = inet6_release,
.bind = mptcp_bind,
.connect = mptcp_stream_connect,
.socketpair = sock_no_socketpair,
