netdev - Re: [PATCH net 1/2] netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources

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Date:   Fri, 21 Oct 2022 16:28:29 +0800
From:   shaozhengchao <shaozhengchao@...wei.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <pabeni@...hat.com>, <jiri@...lanox.com>,
        <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>
Subject: Re: [PATCH net 1/2] netdevsim: fix memory leak in nsim_drv_probe()
 when nsim_dev_resources_register() failed



On 2022/10/21 8:26, Jakub Kicinski wrote:
> On Thu, 20 Oct 2022 10:33:57 +0800 Zhengchao Shao wrote:
>> Fixes: 8fb4bc6fd5bd ("netdevsim: rename devlink.c to dev.c to contain per-dev(asic) items")
> 
> Looks like a rename patch.
> 
> The Fixes tag must point to the commit which introduced the bug.
> 
OK, I will check it.
>> diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
>> index 794fc0cc73b8..39231c5319de 100644
>> --- a/drivers/net/netdevsim/dev.c
>> +++ b/drivers/net/netdevsim/dev.c
>> @@ -1554,7 +1554,7 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
>>   
>>   	err = nsim_dev_resources_register(devlink);
>>   	if (err)
>> -		goto err_vfc_free;
>> +		goto err_dl_unregister;
> 
> It's better to add the devl_resources_unregister() call to the error
> path of nsim_dev_resources_register(). There should be no need to clean
> up after functions when they fail.
> 
Hi Jakub:
	Thank you for your review. I will change it in v2.

Zhengchao Shao
>>   	err = devlink_params_register(devlink, nsim_devlink_params,
>>   				      ARRAY_SIZE(nsim_devlink_params));
>> @@ -1627,7 +1627,6 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
>>   				  ARRAY_SIZE(nsim_devlink_params));
>>   err_dl_unregister:
>>   	devl_resources_unregister(devlink);
>> -err_vfc_free:
>>   	kfree(nsim_dev->vfconfigs);