From bec964ed3b2549086e1fdfbf7f1ce8c22f89baa4 Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Wed, 20 Mar 2013 10:50:50 +0100 Subject: NFC: llcp: Detach socket from process context only when releasing the socket Calling sock_orphan when e.g. the NFC adapter is removed can lead to kernel crashes when e.g. a connection less client is sleeping on the Rx workqueue, waiting for data to show up. Signed-off-by: Samuel Ortiz --- net/nfc/llcp/llcp.c | 6 ------ net/nfc/llcp/sock.c | 2 -- 2 files changed, 8 deletions(-) (limited to 'net/nfc') diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c index b530afadd76c..336813ff8cd5 100644 --- a/net/nfc/llcp/llcp.c +++ b/net/nfc/llcp/llcp.c @@ -107,8 +107,6 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen, accept_sk->sk_state_change(sk); bh_unlock_sock(accept_sk); - - sock_orphan(accept_sk); } if (listen == true) { @@ -134,8 +132,6 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen, bh_unlock_sock(sk); - sock_orphan(sk); - sk_del_node_init(sk); } @@ -164,8 +160,6 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen, bh_unlock_sock(sk); - sock_orphan(sk); - sk_del_node_init(sk); } diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c index 5c7cdf3f2a83..e488e440186a 100644 --- a/net/nfc/llcp/sock.c +++ b/net/nfc/llcp/sock.c @@ -464,8 +464,6 @@ static int llcp_sock_release(struct socket *sock) nfc_llcp_accept_unlink(accept_sk); release_sock(accept_sk); - - sock_orphan(accept_sk); } } -- cgit v1.2.3 From b3155155440190de78fb501953136a6c5b82e327 Mon Sep 17 00:00:00 2001 From: Thierry Escande Date: Wed, 20 Mar 2013 16:00:16 +0100 Subject: NFC: llcp: Remove possible double call to kfree_skb kfree_skb was called twice when the socket receive queue is full Signed-off-by: Thierry Escande Signed-off-by: Samuel Ortiz --- net/nfc/llcp/llcp.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'net/nfc') diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c index 336813ff8cd5..ee25f25f0cd6 100644 --- a/net/nfc/llcp/llcp.c +++ b/net/nfc/llcp/llcp.c @@ -821,7 +821,6 @@ static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, skb_get(skb); } else { pr_err("Receive queue is full\n"); - kfree_skb(skb); } nfc_llcp_sock_put(llcp_sock); @@ -1022,7 +1021,6 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, skb_get(skb); } else { pr_err("Receive queue is full\n"); - kfree_skb(skb); } } -- cgit v1.2.3 From 39a352a5b5896403ad4ce842a9bc3845a01c02cd Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Tue, 26 Mar 2013 14:35:57 +0100 Subject: NFC: llcp: Keep the connected socket parent pointer alive And avoid decreasing the ack log twice when dequeueing connected LLCP sockets. Signed-off-by: Samuel Ortiz --- net/nfc/llcp/sock.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'net/nfc') diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c index e488e440186a..8f025746f337 100644 --- a/net/nfc/llcp/sock.c +++ b/net/nfc/llcp/sock.c @@ -270,7 +270,9 @@ struct sock *nfc_llcp_accept_dequeue(struct sock *parent, } if (sk->sk_state == LLCP_CONNECTED || !newsock) { - nfc_llcp_accept_unlink(sk); + list_del_init(&lsk->accept_queue); + sock_put(sk); + if (newsock) sock_graft(sk, newsock); -- cgit v1.2.3 From d26d6504f23e803824e8ebd14e52d4fc0a0b09cb Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Sun, 7 Apr 2013 01:51:58 +0000 Subject: NFC: llcp: fix info leaks via msg_name in llcp_sock_recvmsg() The code in llcp_sock_recvmsg() does not initialize all the members of struct sockaddr_nfc_llcp when filling the sockaddr info. Nor does it initialize the padding bytes of the structure inserted by the compiler for alignment. Also, if the socket is in state LLCP_CLOSED or is shutting down during receive the msg_namelen member is not updated to 0 while otherwise returning with 0, i.e. "success". The msg_namelen update is also missing for stream and seqpacket sockets which don't fill the sockaddr info. Both issues lead to the fact that the code will leak uninitialized kernel stack bytes in net/socket.c. Fix the first issue by initializing the memory used for sockaddr info with memset(0). Fix the second one by setting msg_namelen to 0 early. It will be updated later if we're going to fill the msg_name member. Cc: Lauro Ramos Venancio Cc: Aloisio Almeida Jr Cc: Samuel Ortiz Signed-off-by: Mathias Krause Signed-off-by: David S. Miller --- net/nfc/llcp/sock.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/nfc') diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c index 8f025746f337..6c94447ec414 100644 --- a/net/nfc/llcp/sock.c +++ b/net/nfc/llcp/sock.c @@ -646,6 +646,8 @@ static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, pr_debug("%p %zu\n", sk, len); + msg->msg_namelen = 0; + lock_sock(sk); if (sk->sk_state == LLCP_CLOSED && @@ -691,6 +693,7 @@ static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap); + memset(sockaddr, 0, sizeof(*sockaddr)); sockaddr->sa_family = AF_NFC; sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP; sockaddr->dsap = ui_cb->dsap; -- cgit v1.2.3