linux-kernel - Re: [PATCH -next] platform/chrome: Fix off-by-one error in wilco

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Date:   Thu, 21 Feb 2019 08:58:18 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Nick Crews <ncrews@...omium.org>
Cc:     Benson Leung <bleung@...omium.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Duncan Laurie <dlaurie@...omium.org>
Subject: Re: [PATCH -next] platform/chrome: Fix off-by-one error in
 wilco_ec/debugfs.c

Hi,

On 20/2/19 23:15, Nick Crews wrote:
> Hi Enric,
> 
> On Wed, Feb 20, 2019 at 3:06 PM Enric Balletbo i Serra
> <enric.balletbo@...labora.com> wrote:
>>
>> Hi Nick,
>>
>> Thanks for the patch.
>>
>> On 20/2/19 22:58, Nick Crews wrote:
>>> Before, in debugfs.c it was possible to supply only the message type,
>>> and not supply any other arguments when sending raw commands. However,
>>> this is never used by the EC, and it led to an underflow error. Now,
>>> just don't allow too short of a command, we will never need
>>> that anyways.
>>>
>>> Fixes: 46c7fd06f8c9 ("platform/chrome: wilco_ec: Add support for raw commands in debugfs")
>>
>> As this is -next material I'd like to squash the fix if you don't mind.
> 
> 
> Please do. Fixing something after it's already in the tree was a new
> process for me,
> so I tried to copy other people's examples. Please let me know
> if there's anything else I should do something different next time.
> 

Squashed and pushed for 5.1

Thanks,
 Enric


> Nick
> 
>>
>> -- Enric
>>
>>> Signed-off-by: Nick Crews <ncrews@...omium.org>
>>> ---
>>>  drivers/platform/chrome/wilco_ec/debugfs.c | 6 +++---
>>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/platform/chrome/wilco_ec/debugfs.c b/drivers/platform/chrome/wilco_ec/debugfs.c
>>> index 46ff3b6c46c7..c090db2cd5be 100644
>>> --- a/drivers/platform/chrome/wilco_ec/debugfs.c
>>> +++ b/drivers/platform/chrome/wilco_ec/debugfs.c
>>> @@ -136,8 +136,8 @@ static ssize_t raw_write(struct file *file, const char __user *user_buf,
>>>       ret = parse_hex_sentence(buf, kcount, request_data, TYPE_AND_DATA_SIZE);
>>>       if (ret < 0)
>>>               return ret;
>>> -     /* Need at least two bytes for message type */
>>> -     if (ret < 2)
>>> +     /* Need at least two bytes for message type and one for command */
>>> +     if (ret < 3)
>>>               return -EINVAL;
>>>
>>>       /* Clear response data buffer */
>>> @@ -145,7 +145,7 @@ static ssize_t raw_write(struct file *file, const char __user *user_buf,
>>>
>>>       msg.type = request_data[0] << 8 | request_data[1];
>>>       msg.flags = WILCO_EC_FLAG_RAW;
>>> -     msg.command = ret > 2 ? request_data[2] : 0;
>>> +     msg.command = request_data[2];
>>>       msg.request_data = ret > 3 ? request_data + 3 : 0;
>>>       msg.request_size = ret - 3;
>>>       msg.response_data = debug_info->raw_data;
>>>