linux-kernel - Re: [3.4 PATCH] Bluetooth: Fix invalid length check in l2cap_information

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Message-ID: <5525D11B.3010601@huawei.com>
Date:	Thu, 9 Apr 2015 09:08:43 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Tim Niemeyer <tim.niemeyer@...science.de>
CC:	<stable@...r.kernel.org>,
	Jaganath Kanakkassery <jaganath.k@...sung.com>,
	Chan-Yeol Park <chanyeol.park@...sung.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Jianguo Wu <wujianguo@...wei.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	<linux-bluetooth@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [3.4 PATCH] Bluetooth: Fix invalid length check in l2cap_information_rsp()

On 2015/3/30 17:27, Tim Niemeyer wrote:
> first backport commit 6ec88fcb4aa2c33fe2fe2a23c576a7e2581c5c3d changes
> l2cap_move_channel_confirm_rsp and not the l2cap_information_rsp. So
> revert this and fix at the correct position.
> 
> 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
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Jaganath Kanakkassery <jaganath.k@...sung.com>
> Signed-off-by: Chan-Yeol Park <chanyeol.park@...sung.com>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> Cc: Jianguo Wu <wujianguo@...wei.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Tim Niemeyer <tim.niemeyer@...science.de>
> Acked-by: Johan Hedberg <johan.hedberg@...el.com>
> ---
> Patch for 3.4-stable.
> 

Queued up for 3.4. Thanks!
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