NFC: llcp: two bugs in ->getname()

The sockaddr_nfc_llcp struct has as hole between ->sa_family and
->dev_idx so I've added a memset() to clear it and prevent an
information leak.

Also the ->nfc_protocol element wasn't set so I've added that.

"uaddr->sa_family" and "llcp_addr->sa_family" are the same thing but
it's less confusing to use llcp_addr consistently throughout.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c
index 6c94447ec414..e16315719eaf 100644
--- a/net/nfc/llcp/sock.c
+++ b/net/nfc/llcp/sock.c
@@ -358,12 +358,13 @@ static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
         pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
                  llcp_sock->dsap, llcp_sock->ssap);
 
-        uaddr->sa_family = AF_NFC;
-
+        memset(llcp_addr, 0, sizeof(*llcp_addr));
         *len = sizeof(struct sockaddr_nfc_llcp);
 
+        llcp_addr->sa_family = AF_NFC;
         llcp_addr->dev_idx = llcp_sock->dev->idx;
         llcp_addr->target_idx = llcp_sock->target_idx;
+        llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
         llcp_addr->dsap = llcp_sock->dsap;
         llcp_addr->ssap = llcp_sock->ssap;
         llcp_addr->service_name_len = llcp_sock->service_name_len;