linux-kernel - Re: [PATCH] [media] ddbridge: fix error handling in module_init

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Date:	Thu, 16 Aug 2012 06:36:41 -0300
From:	Mauro Carvalho Chehab <mchehab@...hat.com>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>
CC:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...ras.ru
Subject: Re: [PATCH] [media] ddbridge: fix error handling in module_init_ddbridge()

Em 16-08-2012 06:26, Mauro Carvalho Chehab escreveu:
> Em 15-08-2012 17:42, Alexey Khoroshilov escreveu:
>> If pci_register_driver() failed, resources allocated in
>> ddb_class_create() are leaked. The patch fixes it.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
>> ---
>>  drivers/media/dvb/ddbridge/ddbridge-core.c |    6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/dvb/ddbridge/ddbridge-core.c b/drivers/media/dvb/ddbridge/ddbridge-core.c
>> index ebf3f05..36aa4e4 100644
>> --- a/drivers/media/dvb/ddbridge/ddbridge-core.c
>> +++ b/drivers/media/dvb/ddbridge/ddbridge-core.c
>> @@ -1705,7 +1705,11 @@ static __init int module_init_ddbridge(void)
>>  	       "Copyright (C) 2010-11 Digital Devices GmbH\n");
>>  	if (ddb_class_create())
>>  		return -1;
> 
> This is not right. It should be returning a proper error code.

Please discard this email. I already commented this on a previous email.
This one was a previous draft.

Thanks,
Mauro

> 
> Could you please patch ddb_class_create() in order to make it to
> return the retuned value from IS_ERR() as the error code, and return
> it back to the init code?
> 
> Ok, I noticed that other parts of the driver are also returning wrong
> error codes, but let's fix at least module_init_ddbridge() while you're
> looking into this.
> 
>> -	return pci_register_driver(&ddb_pci_driver);
>> +	if (pci_register_driver(&ddb_pci_driver) < 0) {
>> +		ddb_class_destroy();
>> +		return -1;
> 
> The correct here would be to store the error on a temp register
> and return it, instead of returning -1.
> 
>> +	}
>> +	return 0;
>>  }
>>  
>>  static __exit void module_exit_ddbridge(void)
>>
> 
> Thank you!
> Mauro
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