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Subject[ 098/184] Bluetooth: HCI - Fix info leak in getsockopt(HCI_FILTER)
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit e15ca9a0ef9a86f0477530b0f44a725d67f889ee ]

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 <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>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
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 75302a9..45caaaa 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -576,6 +576,7 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname, char
{
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);
--
1.7.12.2.21.g234cd45.dirty




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