[ 3.8.y.z extended stable ] Patch "Bluetooth: Fix invalid length check in l2cap_information_rsp()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    Bluetooth: Fix invalid length check in l2cap_information_rsp()

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.4.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From e2e57b04c29e7494a1ffaf10dc47721337f2e18f Mon Sep 17 00:00:00 2001
From: Jaganath Kanakkassery <jaganath.k at samsung.com>
Date: Fri, 21 Jun 2013 19:55:11 +0530
Subject: Bluetooth: Fix invalid length check in l2cap_information_rsp()

commit 3f6fa3d489e127ca5a5b298eabac3ff5dbe0e112 upstream.

The length check is invalid since the length varies with type of
info response.

This was introduced by the commit cb3b3152b2f5939d67005cff841a1ca748b19888

Because of this, l2cap info rsp is not handled and command reject is sent.

> ACL data: handle 11 flags 0x02 dlen 16
        L2CAP(s): Info rsp: type 2 result 0
          Extended feature mask 0x00b8
            Enhanced Retransmission mode
            Streaming mode
            FCS Option
            Fixed Channels
< ACL data: handle 11 flags 0x00 dlen 10
        L2CAP(s): Command rej: reason 0
          Command not understood

Signed-off-by: Jaganath Kanakkassery <jaganath.k at samsung.com>
Signed-off-by: Chan-Yeol Park <chanyeol.park at samsung.com>
Acked-by: Johan Hedberg <johan.hedberg at intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/bluetooth/l2cap_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 9f03abb..e133d58 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -4229,7 +4229,7 @@ static inline int l2cap_information_rsp(struct l2cap_conn *conn,
 	struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
 	u16 type, result;

-	if (cmd_len != sizeof(*rsp))
+	if (cmd_len < sizeof(*rsp))
 		return -EPROTO;

 	type   = __le16_to_cpu(rsp->type);
--
1.8.1.2