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Date:	Wed, 15 Aug 2012 23:31:46 +0200
From:	Mathias Krause <>
To:	"David S. Miller" <>
	Mathias Krause <>,
	Marcel Holtmann <>,
	Gustavo Padovan <>,
	Johan Hedberg <>
Subject: [PATCH 03/14] Bluetooth: HCI - Fix info leak in getsockopt(HCI_FILTER)

The HCI code fails to initialize the two padding bytes of struct
hci_ufilter before copying it to userland -- that for leaking two
bytes kernel stack. Add an explicit memset(0) before filling the
structure to avoid the info leak.

Signed-off-by: Mathias Krause <>
Cc: Marcel Holtmann <>
Cc: Gustavo Padovan <>
Cc: Johan Hedberg <>
 net/bluetooth/hci_sock.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index a7f04de..a27bbc3 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1009,6 +1009,7 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
 			struct hci_filter *f = &hci_pi(sk)->filter;
+			memset(&uf, 0, sizeof(uf));
 			uf.type_mask = f->type_mask;
 			uf.opcode    = f->opcode;
 			uf.event_mask[0] = *((u32 *) f->event_mask + 0);

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