From 40c75f81d6852bb4fd08491074889187f77b8d1f Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Mon, 5 Mar 2012 01:03:51 +0100 Subject: [PATCH] NFC: Fix LLCP sockets releasing path The socket local pointer needs to be set to NULL when the adapter is removed or the MAC goes down. If the socket release code is called after such an event, the socket reference count still needs to be decreased in order for the socket to eventually be freed. Signed-off-by: Samuel Ortiz Signed-off-by: John W. Linville --- net/nfc/llcp/llcp.c | 15 +++++++++++---- net/nfc/llcp/sock.c | 23 +++++++++++++++-------- 2 files changed, 26 insertions(+), 12 deletions(-) diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c index 3ce646e35f6b..8af896dc759e 100644 --- a/net/nfc/llcp/llcp.c +++ b/net/nfc/llcp/llcp.c @@ -47,7 +47,7 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local) /* Release all child sockets */ list_for_each_entry_safe(s, n, &parent->list, list) { - list_del(&s->list); + list_del_init(&s->list); sk = &s->sk; lock_sock(sk); @@ -56,9 +56,12 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local) nfc_put_device(s->dev); sk->sk_state = LLCP_CLOSED; - sock_set_flag(sk, SOCK_DEAD); release_sock(sk); + + sock_orphan(sk); + + s->local = NULL; } parent_sk = &parent->sk; @@ -77,11 +80,12 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local) nfc_llcp_accept_unlink(accept_sk); accept_sk->sk_state = LLCP_CLOSED; - sock_set_flag(accept_sk, SOCK_DEAD); release_sock(accept_sk); sock_orphan(accept_sk); + + lsk->local = NULL; } } @@ -89,9 +93,12 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local) nfc_put_device(parent->dev); parent_sk->sk_state = LLCP_CLOSED; - sock_set_flag(parent_sk, SOCK_DEAD); release_sock(parent_sk); + + sock_orphan(parent_sk); + + parent->local = NULL; } mutex_unlock(&local->socket_lock); diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c index d3861773fab0..35825e20163a 100644 --- a/net/nfc/llcp/sock.c +++ b/net/nfc/llcp/sock.c @@ -315,6 +315,7 @@ static int llcp_sock_release(struct socket *sock) struct sock *sk = sock->sk; struct nfc_llcp_local *local; struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + int err = 0; if (!sk) return 0; @@ -322,15 +323,17 @@ static int llcp_sock_release(struct socket *sock) pr_debug("%p\n", sk); local = llcp_sock->local; - if (local == NULL) - return -ENODEV; + if (local == NULL) { + err = -ENODEV; + goto out; + } mutex_lock(&local->socket_lock); if (llcp_sock == local->sockets[llcp_sock->ssap]) local->sockets[llcp_sock->ssap] = NULL; else - list_del(&llcp_sock->list); + list_del_init(&llcp_sock->list); mutex_unlock(&local->socket_lock); @@ -354,9 +357,7 @@ static int llcp_sock_release(struct socket *sock) release_sock(accept_sk); - sock_set_flag(sk, SOCK_DEAD); sock_orphan(accept_sk); - sock_put(accept_sk); } } @@ -367,14 +368,13 @@ static int llcp_sock_release(struct socket *sock) sk->sk_state == LLCP_LISTEN) nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); - sock_set_flag(sk, SOCK_DEAD); - release_sock(sk); +out: sock_orphan(sk); sock_put(sk); - return 0; + return err; } static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, @@ -645,6 +645,8 @@ struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp) void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) { + struct nfc_llcp_local *local = sock->local; + kfree(sock->service_name); skb_queue_purge(&sock->tx_queue); @@ -653,6 +655,11 @@ void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) list_del_init(&sock->accept_queue); + if (local != NULL && sock == local->sockets[sock->ssap]) + local->sockets[sock->ssap] = NULL; + else + list_del_init(&sock->list); + sock->parent = NULL; } -- 2.39.5