linux-kernel - Re: [v4l-dvb-maintainer] [PATCH] V4L/DVB: potential leak in dvb-bt8xx

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Message-ID: <Pine.LNX.4.58.0610141720560.13331@shell2.speakeasy.net>
Date:	Sat, 14 Oct 2006 17:33:15 -0700 (PDT)
From:	Trent Piepho <xyzzy@...akeasy.org>
To:	Florin Malita <fmalita@...il.com>
cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	v4l-dvb maintainer list <v4l-dvb-maintainer@...uxtv.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [v4l-dvb-maintainer] [PATCH] V4L/DVB: potential leak in dvb-bt8xx

On Sat, 14 Oct 2006, Florin Malita wrote:
> If dvb_attach
> <http://www.coverity.com:7448/display-error.cgi?user=fmalita&magic=8997c91336813f372812011c89e0e75e&source=2693a21be69533084392e43c4f3c5220&runid=86&table=file&line=107>(dst_attach,
> ...) fails in *frontend_init*(), the previously allocated 'state' is
> leaked (Coverity ID 1437).

I believe that 'state' will be kfree'd by the dst_attach() function if there
is a failure.  Not what you would expect, to have it allocated in the bt8xx
driver (why do is there??) and freed on error in a different function.

You know, I had a patch to fix all these dst problems two months ago....

>
> Also, when allocating 'state' the result of kmalloc() needs to be checked.
>
> Signed-off-by: Florin Malita <fmalita@...il.com>
> ---
>
>  drivers/media/dvb/bt8xx/dvb-bt8xx.c |    4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/media/dvb/bt8xx/dvb-bt8xx.c b/drivers/media/dvb/bt8xx/dvb-bt8xx.c
> index fb6c4cc..d22ba4e 100644
> --- a/drivers/media/dvb/bt8xx/dvb-bt8xx.c
> +++ b/drivers/media/dvb/bt8xx/dvb-bt8xx.c
> @@ -665,6 +665,9 @@ static void frontend_init(struct dvb_bt8
>  	case BTTV_BOARD_TWINHAN_DST:
>  		/*	DST is not a frontend driver !!!		*/
>  		state = (struct dst_state *) kmalloc(sizeof (struct dst_state), GFP_KERNEL);
> +		if (!state)
> +			break;
> +
>  		/*	Setup the Card					*/
>  		state->config = &dst_config;
>  		state->i2c = card->i2c_adapter;
> @@ -673,6 +676,7 @@ static void frontend_init(struct dvb_bt8
>  		/*	DST is not a frontend, attaching the ASIC	*/
>  		if (dvb_attach(dst_attach, state, &card->dvb_adapter) == NULL) {
>  			printk("%s: Could not find a Twinhan DST.\n", __FUNCTION__);
> +			kfree(state);
>  			break;
>  		}
>  		/*	Attach other DST peripherals if any		*/
>
>
>
> _______________________________________________
> v4l-dvb-maintainer mailing list
> v4l-dvb-maintainer@...uxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/v4l-dvb-maintainer
>
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