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

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Date:	Thu, 16 Aug 2012 06:26:28 -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 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.

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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