Re: [PATCH] drivers: base: transport_class: fix possible memory leak

[Yang Yingliang <yangyingliang@huawei.com>]

Hi Greg,

On 2022/11/10 16:18, Greg KH wrote:
> On Thu, Nov 10, 2022 at 11:48:09AM +0800, Yang Yingliang wrote:
>> Current some drivers(like iscsi) call transport_register_device()
>> failed, they don't call transport_destroy_device() to release the
>> memory allocated in transport_setup_device(), because they don't
>> know what was done, it should be internal thing to release the
>> resource in register function. So fix this leak by calling destroy
>> function inside register function.
>>
>> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
>> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
>> ---
>>   include/linux/transport_class.h | 9 ++++++++-
>>   1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h
>> index 63076fb835e3..f4835250bbfc 100644
>> --- a/include/linux/transport_class.h
>> +++ b/include/linux/transport_class.h
>> @@ -70,8 +70,15 @@ void transport_destroy_device(struct device *);
>>   static inline int
>>   transport_register_device(struct device *dev)
>>   {
>> +	int ret;
>> +
>>   	transport_setup_device(dev);
>> -	return transport_add_device(dev);
>> +	ret = transport_add_device(dev);
>> +	if (ret) {
>> +		transport_destroy_device(dev);
>> +	}
> Please use scripts/checkpatch.pl on your patches before sending them out
Sure, of course. :)
> so you don't get grumpy maintainers asking you to use
> scripts/checkpatch.pl on your patches :)
I sent a fix patch to iscsi system earlier:
https://patchwork.kernel.org/project/linux-scsi/patch/20221109092421.3111613-1-yangyingliang@huawei.com/

Mike give his point in the mail, so I send a new patch keep iscsi 
maintainers Cced.

Thanks,
Yang
>
> thanks,
>
> greg k-h
>
> .