From: Amadeusz Sławiński <amadeusz.slawinski@tieto.com>
Date: Thu, 14 Jul 2016 08:50:23 +0000 (+0200)
Subject: Bluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU
X-Git-Tag: v3.16.39~269
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=2d6f94ebcd19b2e65fbadcea5ab42c1d08faf7ca;p=thirdparty%2Fkernel%2Fstable.git

Bluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU

commit 23bc6ab0a0912146fd674a0becc758c3162baabc upstream.

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@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index d0fd8b04f2e66..071d35c9f3b48 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -921,7 +921,7 @@ 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;
 		}