linux-kernel - [PATCH] Bluetooth: Fix l2cap_sock_setsockopt() with optname BT

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Date:	Thu, 14 Jul 2016 10:50:23 +0200
From:	Amadeusz Sławiński 
	<amadeusz.slawinski@...to.com>
To:	linux-bluetooth@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Johan Hedberg <johan.hedberg@...il.com>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Amadeusz Sławiński 
	<amadeusz.slawinski@...to.com>
Subject: [PATCH] Bluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU

When we retrieve imtu value from userspace we should use 16 bit pointer
cast instead of 32 as it's defined that way in headers. Fixes setsockopt
calls on big-endian platforms.

Signed-off-by: Amadeusz Sławiński <amadeusz.slawinski@...to.com>
---
 net/bluetooth/l2cap_sock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 388ee8b..1842141 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -927,7 +927,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (get_user(opt, (u16 __user *) optval)) {
 			err = -EFAULT;
 			break;
 		}
-- 
1.9.1