unix_diag: fix info leak

[ Upstream commit 6865d1e834be84ddd5808d93d5035b492346c64a ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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);