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Bluetooth: HCI - Fix info leak in getsockopt(HCI_FILTER)

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[ Upstream commit e15ca9a0ef ]

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>
This commit is contained in:
Mathias Krause
2012-08-15 11:31:46 +00:00
committed by Greg Kroah-Hartman
parent d5d3ca708a
commit 1b917a7e47
1 changed files with 1 additions and 0 deletions
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1
net/bluetooth/hci_sock.c
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@@ -644,6 +644,7 @@ static int hci_sock_setsockopt(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);