linux-kernel - Re: [PATVH] media, dvb, IX2505V: Remember to free allocated memory in failure path (ix2505v

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Date:	Fri, 31 Dec 2010 08:30:04 -0200
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Jesper Juhl <jj@...osbits.net>
CC:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Malcolm Priestley <tvboxspy@...il.com>
Subject: Re: [PATVH] media, dvb, IX2505V: Remember to free allocated memory
 in failure path (ix2505v_attach()).

Em 30-12-2010 21:11, Jesper Juhl escreveu:
> Hi,
> 
> We may leak the storage allocated to 'state' in 
> drivers/media/dvb/frontends/ix2505v.c::ix2505v_attach() on error.
> This patch makes sure we free the allocated memory in the failure case.
> 
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> ---
>  ix2505v.c |    1 +
>  1 file changed, 1 insertion(+)
> 
>   Compile tested only.
> 
> diff --git a/drivers/media/dvb/frontends/ix2505v.c b/drivers/media/dvb/frontends/ix2505v.c
> index 55f2eba..fcb173d 100644
> --- a/drivers/media/dvb/frontends/ix2505v.c
> +++ b/drivers/media/dvb/frontends/ix2505v.c
> @@ -293,6 +293,7 @@ struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe,
>  		ret = ix2505v_read_status_reg(state);
>  
>  		if (ret & 0x80) {
> +			kfree(state);

Instead of doing the free here, please move it to happen at the error: logic.
Currently, there's just one error condition, but having part of the release/kfree
logic here and there is not a good idea.

>  			deb_i2c("%s: No IX2505V found\n", __func__);
>  			goto error;
>  		}
> 
> 
> 

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