linux-kernel - Re: [PATCH 1/3] char: lp: ensure that index has not exceeded LP

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Date:   Fri, 3 Jun 2022 18:19:24 +0530
From:   Shreenidhi Shedi <yesshedi@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     arnd@...db.de, Shreenidhi Shedi <sshedi@...are.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] char: lp: ensure that index has not exceeded LP_NO

On 03/06/22 6:14 pm, Greg KH wrote:
> On Fri, Jun 03, 2022 at 05:32:25PM +0530, Shreenidhi Shedi wrote:
>> On 03/06/22 5:27 pm, Shreenidhi Shedi wrote:
>>> On 15/05/22 1:24 pm, Shreenidhi Shedi wrote:
>>>> After finishing the loop, index value can be equal to LP_NO and lp_table
>>>> array is of size LP_NO, so this can end up in accessing an out of bound
>>>> address in lp_register function.
>>>>
>>>> Signed-off-by: Shreenidhi Shedi <sshedi@...are.com>
>>>> ---
>>>>  drivers/char/lp.c | 2 +-
>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/char/lp.c b/drivers/char/lp.c
>>>> index bd95aba1f..e61060f3c 100644
>>>> --- a/drivers/char/lp.c
>>>> +++ b/drivers/char/lp.c
>>>> @@ -971,7 +971,7 @@ static void lp_attach(struct parport *port)
>>>>  			if (port_num[i] == -1)
>>>>  				break;
>>>>  
>>>> -		if (!lp_register(i, port))
>>>> +		if (i < LP_NO && !lp_register(i, port))
>>>>  			lp_count++;
>>>>  		break;
>>>>  
>>>
>>> Hi Greg and Arnd Bergmann,
>>>
>>> Please review the above changes. Ignore second patch.
>>>
>>> --
>>> Shedi
>>
>> Sorry, not the second patch. Ignore the 3rd patch which fixes checkspec.pl warnings.
> 
> I have no way to do that, please fix up and resend the correct series,
> our tools can not pick and choose from a series easily.
> 
> Also remember this is the middle of the merge window and we can not do
> anything at the moment.
> 
> greg k-h

No problem, I will send a new patch series with only intended fixes.
It's okay, take the patch when the time is right. Thanks for your prompt response and your time.
 
--
Shedi