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

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Date: Mon, 18 Mar 2024 11:10:51 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] ice: Fix freeing uninitialized pointers

On Mon, Mar 18, 2024 at 08:58:24AM +0100, Jiri Pirko wrote:
> Sat, Mar 16, 2024 at 10:44:40AM CET, dan.carpenter@...aro.org wrote:
> >Automatically cleaned up pointers need to be initialized before exiting
> >their scope.  In this case, they need to be initialized to NULL before
> >any return statement.
> >
> >Fixes: 90f821d72e11 ("ice: avoid unnecessary devm_ usage")
> >Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> >---
> > drivers/net/ethernet/intel/ice/ice_common.c  | 4 ++--
> > drivers/net/ethernet/intel/ice/ice_ethtool.c | 2 +-
> > 2 files changed, 3 insertions(+), 3 deletions(-)
> >
> >diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
> >index 4d8111aeb0ff..4b27d2bc2912 100644
> >--- a/drivers/net/ethernet/intel/ice/ice_common.c
> >+++ b/drivers/net/ethernet/intel/ice/ice_common.c
> >@@ -1002,8 +1002,8 @@ static void ice_get_itr_intrl_gran(struct ice_hw *hw)
> >  */
> > int ice_init_hw(struct ice_hw *hw)
> > {
> >-	struct ice_aqc_get_phy_caps_data *pcaps __free(kfree);
> >-	void *mac_buf __free(kfree);
> >+	struct ice_aqc_get_phy_caps_data *pcaps __free(kfree) = NULL;
> >+	void *mac_buf __free(kfree) = NULL;
> > 	u16 mac_buf_len;
> > 	int status;
> > 
> 
> How about similar issues in:
> ice_set_fc()
> ice_cfg_phy_fec()
> ?

Yeah.  Sorry, I'll resend.  Smatch didn't warn about those bugs because
the sanity checks are the begining of the functions:

	if (!pi || !aq_failures)
		return -EINVAL;

are never true...  It's the first time I've run into this as an issue.

regards,
dan carpenter