From: Vasiliy Kulikov <segoon@openwall.com>
Date: Thu, 10 Feb 2011 17:59:42 +0000 (+0300)
Subject: Bluetooth: l2cap: fix 1 byte infoleak to userspace
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e3fb592b15602196d38b225dc78aab8d631a5f89;p=openwrt%2Fstaging%2Fblogic.git

Bluetooth: l2cap: fix 1 byte infoleak to userspace

Structure l2cap_options has one padding byte between max_tx and
txwin_size fields.  This byte in "opts" is copied to userspace
uninitialized.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
---

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index adf41692daf3..21f5385ca24d 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -392,6 +392,7 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __us
 
 	switch (optname) {
 	case L2CAP_OPTIONS:
+		memset(&opts, 0, sizeof(opts));
 		opts.imtu     = l2cap_pi(sk)->imtu;
 		opts.omtu     = l2cap_pi(sk)->omtu;
 		opts.flush_to = l2cap_pi(sk)->flush_to;