linux-kernel - Re: [PATCH] lightnvm: fix memory leak

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Date:	Mon, 23 Nov 2015 19:41:10 +0100
From:	Matias <mb@...htnvm.io>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] lightnvm: fix memory leak

On 11/23/2015 05:40 PM, Sudip Mukherjee wrote:
> On Mon, Nov 23, 2015 at 04:13:39PM +0100, Matias Bjørling wrote:
>> On 11/23/2015 11:35 AM, Sudip Mukherjee wrote:
>>> If copy_to_user() fails we returned error but we missed releasing
>>> devices.
>>>
>>> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
>>> ---
>>>   drivers/lightnvm/core.c | 5 ++++-
>>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
>>> index f659e60..6688b60 100644
>>> --- a/drivers/lightnvm/core.c
>>> +++ b/drivers/lightnvm/core.c
>>> @@ -721,8 +721,11 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
>>>
>>>   	devices->nr_devices = i;
>>>
>>> -	if (copy_to_user(arg, devices, sizeof(struct nvm_ioctl_get_devices)))
>>> +	if (copy_to_user(arg, devices,
>>> +			 sizeof(struct nvm_ioctl_get_devices))) {
>>> +		kfree(devices);
>>>   		return -EFAULT;
>>> +	}
>>>
>>>   	kfree(devices);
>>>   	return 0;
>>>
>>
>> Thanks Sudip, it seems like this error is in some of the others
>> ioctl's as well. Do you want to send a patch with the fixes for them
>> all?

Sure, That'll be great. Then I'll apply it.

>
> I can find a similar error in nvm_ioctl_info(). I will have a close look
> tomorrow and send a patch. Is this patch applied or should I send a
> combined patch fixing all these similar errors?

A combined will be great. It fixes the same type of error. Thank you.
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