6.6-stable review patch. If anyone has any objections, please let me know.
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From: Kuniyuki Iwashima kuniyu@amazon.com
commit aed6ecef55d70de3762ce41c561b7f547dbaf107 upstream.
This is a prep patch for the following change, where we need to fetch the listening socket from the successor embryo socket during GC.
We add a new field to struct unix_sock to save a pointer to a listening socket.
We set it when connect() creates a new socket, and clear it when accept() is called.
Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Acked-by: Paolo Abeni pabeni@redhat.com Link: https://lore.kernel.org/r/20240325202425.60930-8-kuniyu@amazon.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/af_unix.h | 1 + net/unix/af_unix.c | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-)
--- a/include/net/af_unix.h +++ b/include/net/af_unix.h @@ -83,6 +83,7 @@ struct unix_sock { struct path path; struct mutex iolock, bindlock; struct sock *peer; + struct sock *listener; struct unix_vertex *vertex; struct list_head link; unsigned long inflight; --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -978,6 +978,7 @@ static struct sock *unix_create1(struct sk->sk_max_ack_backlog = READ_ONCE(net->unx.sysctl_max_dgram_qlen); sk->sk_destruct = unix_sock_destructor; u = unix_sk(sk); + u->listener = NULL; u->inflight = 0; u->vertex = NULL; u->path.dentry = NULL; @@ -1582,6 +1583,7 @@ restart: newsk->sk_type = sk->sk_type; init_peercred(newsk); newu = unix_sk(newsk); + newu->listener = other; RCU_INIT_POINTER(newsk->sk_wq, &newu->peer_wq); otheru = unix_sk(other);
@@ -1677,8 +1679,8 @@ static int unix_accept(struct socket *so bool kern) { struct sock *sk = sock->sk; - struct sock *tsk; struct sk_buff *skb; + struct sock *tsk; int err;
err = -EOPNOTSUPP; @@ -1703,6 +1705,7 @@ static int unix_accept(struct socket *so }
tsk = skb->sk; + unix_sk(tsk)->listener = NULL; skb_free_datagram(sk, skb); wake_up_interruptible(&unix_sk(sk)->peer_wait);