From: Gustavo F. Padovan <padovan@profusion.mobi>
Date: Mon, 4 Oct 2010 22:28:52 +0000 (-0300)
Subject: Bluetooth: Disallow to change L2CAP_OPTIONS values when connected
X-Git-Tag: v2.6.36-rc8~2^2~15^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eaa71b318c5ed0cd1ac3182a533471dc5edf372d;p=platform%2Fkernel%2Flinux-exynos.git

Bluetooth: Disallow to change L2CAP_OPTIONS values when connected

L2CAP doesn't permit change like MTU, FCS, TxWindow values while the
connection is alive, we can only set that before the
connection/configuration process. That can lead to bugs in the L2CAP
operation.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
---

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 44a8fb0..0b54b7d 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1950,6 +1950,11 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __us
 
 	switch (optname) {
 	case L2CAP_OPTIONS:
+		if (sk->sk_state == BT_CONNECTED) {
+			err = -EINVAL;
+			break;
+		}
+
 		opts.imtu     = l2cap_pi(sk)->imtu;
 		opts.omtu     = l2cap_pi(sk)->omtu;
 		opts.flush_to = l2cap_pi(sk)->flush_to;