linux-kernel - Re: [PATCH] net: iucv: Free memory obtained by kzalloc

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Date:   Wed, 28 Feb 2018 17:14:55 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     Cornelia Huck <cohuck@...hat.com>
Cc:     jwi@...ux.vnet.ibm.com, ubraun@...ux.vnet.ibm.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: iucv: Free memory obtained by kzalloc



On Wednesday 28 February 2018 04:00 PM, Cornelia Huck wrote:
> On Wed, 28 Feb 2018 15:24:16 +0530
> Arvind Yadav <arvind.yadav.cs@...il.com> wrote:
>
>> Free memory, if afiucv_iucv_init is not successful and
>> removing a IUCV driver.
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>> ---
>>   net/iucv/af_iucv.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
>> index 1e8cc7b..eb0995a 100644
>> --- a/net/iucv/af_iucv.c
>> +++ b/net/iucv/af_iucv.c
>> @@ -2433,9 +2433,11 @@ static int afiucv_iucv_init(void)
>>   	af_iucv_dev->driver = &af_iucv_driver;
>>   	err = device_register(af_iucv_dev);
>>   	if (err)
>> -		goto out_driver;
>> +		goto out_iucv_dev;
>>   	return 0;
>>   
>> +out_iucv_dev:
>> +	kfree(af_iucv_dev);
>>   out_driver:
>>   	driver_unregister(&af_iucv_driver);
>>   out_iucv:
>> @@ -2496,6 +2498,7 @@ static void __exit afiucv_exit(void)
>>   {
>>   	if (pr_iucv) {
>>   		device_unregister(af_iucv_dev);
>> +		kfree(af_iucv_dev);
>>   		driver_unregister(&af_iucv_driver);
>>   		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
>>   		symbol_put(iucv_if);
> No, you must not use kfree() after you called device_register() (even
> if it was not successful!) -- see the comment for device_register().
Yes, Your are right. First we need to call put_device() then kfree().
I will send updated patch.
~arvind