Bluetooth: HCI - Fix info leak via getsockname()

[ Upstream commit 3f68ba07b1da811bf383b4b701b129bfcb2e4988 ]

The HCI code fails to initialize the hci_channel member of struct
sockaddr_hci and that for leaks two bytes kernel stack via the
getsockname() syscall. Initialize hci_channel with 0 to avoid the
info leak.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 2f6ab5b8f2146785b55bd80932c02b45f803370a..bedc768c8cdfe6c80068020745a884df27989b8e 100644 (file)
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -706,6 +706,7 @@ static int hci_sock_getname(struct socket *sock, struct sockaddr *addr, int *add
        *addr_len = sizeof(*haddr);
        haddr->hci_family = AF_BLUETOOTH;
        haddr->hci_dev    = hdev->id;
+       haddr->hci_channel= 0;
 
        release_sock(sk);
        return 0;