Commit 6482f554 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont Committed by David S. Miller
Browse files

Phonet: remove dangling pipe if an endpoint is closed early 



Closing a pipe endpoint is not normally allowed by the Phonet pipe,
other than as a side after-effect of removing the pipe between two
endpoints. But there is no way to prevent Linux userspace processes
from being killed or suffering from bugs, so this can still happen.
We might as well forcefully close Phonet pipe endpoints then.

The cellular modem supports only a few existing pipes at a time. So we
really should not leak them. This change instructs the modem to destroy
the pipe if either of the pipe's endpoint (Linux socket) is closed too
early.

Signed-off-by: default avatarRémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7fedd7e5

include/net/phonet/pep.h

+5 −0
Original line number Diff line number Diff line
@@ -77,6 +77,11 @@ static inline struct pnpipehdr *pnp_hdr(struct sk_buff *skb) 
#define MAX_PNPIPE_HEADER (MAX_PHONET_HEADER + 4)



enum {

	PNS_PIPE_CREATE_REQ = 0x00,

	PNS_PIPE_CREATE_RESP,

	PNS_PIPE_REMOVE_REQ,

	PNS_PIPE_REMOVE_RESP,



	PNS_PIPE_DATA = 0x20,

	PNS_PIPE_ALIGNED_DATA,

net/phonet/pep.c

+26 −1
Original line number Diff line number Diff line
@@ -620,6 +620,28 @@ drop: 
	return err;

}



static int pipe_do_remove(struct sock *sk)

{

	struct pep_sock *pn = pep_sk(sk);

	struct pnpipehdr *ph;

	struct sk_buff *skb;



	skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL);

	if (!skb)

		return -ENOMEM;



	skb_reserve(skb, MAX_PNPIPE_HEADER);

	__skb_push(skb, sizeof(*ph));

	skb_reset_transport_header(skb);

	ph = pnp_hdr(skb);

	ph->utid = 0;

	ph->message_id = PNS_PIPE_REMOVE_REQ;

	ph->pipe_handle = pn->pipe_handle;

	ph->data[0] = PAD;



	return pn_skb_send(sk, skb, &pipe_srv);

}



/* associated socket ceases to exist */

static void pep_sock_close(struct sock *sk, long timeout)

{
@@ -638,7 +660,10 @@ static void pep_sock_close(struct sock *sk, long timeout) 
		sk_for_each_safe(sknode, p, n, &pn->ackq)

			sk_del_node_init(sknode);

		sk->sk_state = TCP_CLOSE;

	}

	} else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))

		/* Forcefully remove dangling Phonet pipe */

		pipe_do_remove(sk);



	ifindex = pn->ifindex;

	pn->ifindex = 0;

	release_sock(sk);

CRA Git | Maintained and supported by SUSTech CRA and CCSE