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

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Message-ID: <Zff0IO6nqpMiGXl5@nanopsycho>
Date: Mon, 18 Mar 2024 08:58:24 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Dan Carpenter <dan.carpenter@...aro.org>
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

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()
?


>diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
>index 255a9c8151b4..78b833b3e1d7 100644
>--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
>+++ 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");
>-- 
>2.43.0
>
>