unix_diag: fix info leak

When filling the netlink message we miss to wipe the pad field,
therefore leak one byte of heap memory to userland. Fix this by
setting pad to 0.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/unix/diag.c b/net/unix/diag.c
index d591091603bfe4da1d6a87810287bdd5aaecc6da..86fa0f3b2cafa46d47db9cd03e46dfe89c22d238 100644 (file)
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -124,6 +124,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r
        rep->udiag_family = AF_UNIX;
        rep->udiag_type = sk->sk_type;
        rep->udiag_state = sk->sk_state;
+       rep->pad = 0;
        rep->udiag_ino = sk_ino;
        sock_diag_save_cookie(sk, rep->udiag_cookie);