linux-kernel - Re: [v11,3/3] Bluetooth: hci_uart: Support firmware download for Marvell

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Date:	Thu, 30 Jun 2016 12:54:00 +0200
From:	Loic Poulain <loic.poulain@...el.com>
To:	Amitkumar Karwar <akarwar@...vell.com>,
	Jeffy Chen <jeffy.chen@...k-chips.com>,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ganapathi Bhat <gbhat@...vell.com>,
	Cathy Luo <cluo@...vell.com>,
	Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [v11,3/3] Bluetooth: hci_uart: Support firmware download for
 Marvell

Hi Amitkumar,


> Hi Marcel,

I suggest you to add Marcel as recipient of your patches.

>
>> From: Jeffy Chen [mailto:jeffy.chen@...k-chips.com]
>> Sent: Friday, June 24, 2016 11:32 AM
>> To: Amitkumar Karwar; linux-bluetooth@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org; Ganapathi Bhat
>> Subject: Re: [v11,3/3] Bluetooth: hci_uart: Support firmware download
>> for Marvell
>>
>> On 2016-5-6 23:31, Amitkumar Karwar wrote:
>>> From: Ganapathi Bhat <gbhat@...vell.com>
>>>
>>> This patch implement firmware download feature for Marvell Bluetooth
>>> devices. If firmware is already downloaded, it will skip downloading.


>>> +static struct sk_buff *mrvl_process_fw_data(struct hci_uart *hu,
>>> +					    struct sk_buff *skb,
>>> +					    u8 *buf, int count)
>>> +{
>>> +	struct mrvl_data *mrvl = hu->priv;
>>> +	struct fw_data *fw_data = mrvl->fwdata;
>>> +	int i = 0, len;
>>> +
>>> +	if (!skb) {
>>> +		while (buf[i] != fw_data->expected_ack && i < count)
>>> +			i++;
>>> +		if (i == count)
>>> +			return ERR_PTR(-EILSEQ);
>>> +
>>> +		skb = bt_skb_alloc(MRVL_FW_HDR_LEN, GFP_KERNEL);

Why you don't test skb here.

>>> +	}
>>> +
>>> +	if (!skb)
>>> +		return ERR_PTR(-ENOMEM);
>>> +
>>> +	len = count - i;
>>> +	memcpy(skb_put(skb, len), &buf[i], len);

You copy all the remaining data from buf into your skb, but what if buf 
contains more than one packet ? out of skb.
Don't assume that buf contains a full packet as well as only one packet.


Regards,
Loic