linux-kernel - [v2.6.34-stable 102/165] Bluetooth: l2cap and rfcomm: fix 1 byte infoleak to userspace.

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Date:	Wed, 15 Aug 2012 15:47:26 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Filip Palian <s3810@...stk.edu.pl>,
	Filip Palian <filip.palian@...stk.edu.pl>,
	"Gustavo F. Padovan" <padovan@...fusion.mobi>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [v2.6.34-stable 102/165] Bluetooth: l2cap and rfcomm: fix 1 byte infoleak to userspace.

From: Filip Palian <s3810@...stk.edu.pl>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 8d03e971cf403305217b8e62db3a2e5ad2d6263f upstream.

Structures "l2cap_conninfo" and "rfcomm_conninfo" have one padding
byte each. This byte in "cinfo" is copied to userspace uninitialized.

Signed-off-by: Filip Palian <filip.palian@...stk.edu.pl>
Acked-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@...fusion.mobi>
[PG: l2cap_sock.c chunk is in l2cap.c in a 2.6.34 context/baseline]
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/bluetooth/l2cap.c       | 1 +
 net/bluetooth/rfcomm/sock.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index b21e319..0b6cf87 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1898,6 +1898,7 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __us
 			break;
 		}
 
+		memset(&cinfo, 0, sizeof(cinfo));
 		cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
 		memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
 
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 8ed3c37..b045bbb 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -882,6 +882,7 @@ static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __u
 
 		l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
 
+		memset(&cinfo, 0, sizeof(cinfo));
 		cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle;
 		memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3);
 
-- 
1.7.12.rc2

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