linux-kernel - Re: [PATCH net] ice: Fix freeing uninitialized pointers

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Message-ID: <Zfx2VL7xnj4rQoV8@smile.fi.intel.com>
Date: Thu, 21 Mar 2024 20:03:00 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Markus Elfring <Markus.Elfring@....de>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	kernel-janitors@...r.kernel.org, netdev@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	David Laight <David.Laight@...lab.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jiri Pirko <jiri@...nulli.us>, Jonathan Cameron <jic23@...nel.org>,
	Julia Lawall <julia.lawall@...ia.fr>,
	Kees Cook <keescook@...omium.org>,
	Lukasz Czapnik <lukasz.czapnik@...el.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com>
Subject: Re: [PATCH net] ice: Fix freeing uninitialized pointers

On Thu, Mar 21, 2024 at 06:59:00PM +0100, Markus Elfring wrote:

…

> > +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> > @@ -941,11 +941,11 @@ static u64 ice_loopback_test(struct net_device *netdev)
> >  	struct ice_netdev_priv *np = netdev_priv(netdev);
> >  	struct ice_vsi *orig_vsi = np->vsi, *test_vsi;
> >  	struct ice_pf *pf = orig_vsi->back;
> > +	u8 *tx_frame __free(kfree) = NULL;
> >  	u8 broadcast[ETH_ALEN], ret = 0;
> >  	int num_frames, valid_frames;
> >  	struct ice_tx_ring *tx_ring;
> >  	struct ice_rx_ring *rx_ring;
> > -	u8 *tx_frame __free(kfree);
> >  	int i;
> >
> >  	netdev_info(netdev, "loopback test\n");
> 
> How do you think about to reduce the scope for the affected local variable instead
> with the help of a small script (like the following) for the semantic patch language?
> 
> @movement@
> attribute name __free;
> @@
> -u8 *tx_frame __free(kfree);
>  int i;
>  ... when any
>  if (ice_fltr_add_mac(test_vsi, ...))
>  { ... }
> +
> +{
> +u8 *tx_frame __free(kfree) = NULL;
>  if (ice_lbtest_create_frame(pf, &tx_frame, ...))
>  { ... }
>  ... when any
> +}
> +
>  valid_frames = ice_lbtest_receive_frames(...);

I believe you don't understand what the scope of the above can be.

-- 
With Best Regards,
Andy Shevchenko