linux-kernel - Re: [PATCH] lightnvm: free allocated memory when gennvm register fails

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Message-ID: <5652D5E4.8030900@lightnvm.io>
Date:	Mon, 23 Nov 2015 10:01:24 +0100
From:	Matias Bjørling <mb@...htnvm.io>
To:	Wenwei Tao <ww.tao0320@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] lightnvm: free allocated memory when gennvm register
 fails

On 11/23/2015 10:00 AM, Wenwei Tao wrote:
> This is okay with me.

Great, I'll go ahead and apply it.

>
> 2015-11-23 16:47 GMT+08:00 Matias Bjørling <mb@...htnvm.io>:
>> On 11/23/2015 09:29 AM, Wenwei Tao wrote:
>>>
>>> free allocated nvm block and gennvm lun structures when
>>> gennvm register fails, otherwise it will cause memory leak.
>>>
>>> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
>>> ---
>>>    drivers/lightnvm/gennvm.c | 3 +++
>>>    1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
>>> index ae1fb2b..03fc7a5 100644
>>> --- a/drivers/lightnvm/gennvm.c
>>> +++ b/drivers/lightnvm/gennvm.c
>>> @@ -211,12 +211,15 @@ static int gennvm_register(struct nvm_dev *dev)
>>>          ret = gennvm_blocks_init(dev, gn);
>>>          if (ret) {
>>>                  pr_err("gennvm: could not initialize blocks\n");
>>> +               gennvm_blocks_free(dev);
>>> +               gennvm_luns_free(dev);
>>>                  goto err;
>>>          }
>>>
>>>          return 1;
>>>    err:
>>>          kfree(gn);
>>> +       dev->mp = NULL;
>>>          return ret;
>>>    }
>>>
>>>
>> Thanks Tao, would it be okay with you if I apply the patch like this:
>>
>> diff --git i/drivers/lightnvm/gennvm.c w/drivers/lightnvm/gennvm.c
>> index e20e74e..3969a98 100644
>> --- i/drivers/lightnvm/gennvm.c
>> +++ w/drivers/lightnvm/gennvm.c
>> @@ -207,6 +207,14 @@ static int gennvm_blocks_init(struct nvm_dev *dev,
>> struct gen_nvm *gn)
>>          return 0;
>>   }
>>
>> +static void gennvm_free(struct nvm_dev *dev)
>> +{
>> +       gennvm_blocks_free(dev);
>> +       gennvm_luns_free(dev);
>> +       kfree(dev->mp);
>> +       dev->mp = NULL;
>> +}
>> +
>>   static int gennvm_register(struct nvm_dev *dev)
>>   {
>>          struct gen_nvm *gn;
>> @@ -234,16 +242,13 @@ static int gennvm_register(struct nvm_dev *dev)
>>
>>          return 1;
>>   err:
>> -       kfree(gn);
>> +       gennvm_free(dev);
>>          return ret;
>>   }
>>
>>   static void gennvm_unregister(struct nvm_dev *dev)
>>   {
>> -       gennvm_blocks_free(dev);
>> -       gennvm_luns_free(dev);
>> -       kfree(dev->mp);
>> -       dev->mp = NULL;
>> +       gennvm_free(dev);
>>   }
>>
>>

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