net: tipc: fix information leak to userland

Structure sockaddr_tipc is copied to userland with padding bytes after
"id" field in union field "name" unitialized.  It leads to leaking of
contents of kernel stack memory.  We have to initialize them to zero.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 33217fc3d697..e9f0d5004483 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -396,6 +396,7 @@ static int get_name(struct socket *sock, struct sockaddr *uaddr,
         struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
         struct tipc_sock *tsock = tipc_sk(sock->sk);
 
+        memset(addr, 0, sizeof(*addr));
         if (peer) {
                 if ((sock->state != SS_CONNECTED) &&
                         ((peer != 2) || (sock->state != SS_DISCONNECTING)))