netdev - [PATCH net v3] intel/i40e: Fix potential memory leak in i40e_init_recovery

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Date:   Tue, 6 Dec 2022 13:41:46 +0000
From:   Yuan Can <yuancan@...wei.com>
To:     <jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <alice.michael@...el.com>,
        <piotr.marczak@...el.com>, <jeffrey.t.kirsher@...el.com>,
        <leon@...nel.org>, <jiri@...nulli.us>,
        <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>
CC:     <yuancan@...wei.com>
Subject: [PATCH net v3] intel/i40e: Fix potential memory leak in i40e_init_recovery_mode()

The error handling path of i40e_init_recovery_mode() does not handle the
vsi->netdev and pf->vsi, and resource leak can happen if error occurs.

In the meantime, the i40e_probe() returns directly without release
pf->qp_pile when i40e_init_recovery_mode() failed.

Fix by properly releasing vsi->netdev in the error handling path of
i40e_init_recovery_mode() and relying on the error handling path of
i40e_probe() to release pf->vsi and pf->qp_pile if anything goes wrong.

Fixes: 4ff0ee1af016 ("i40e: Introduce recovery mode support")
Signed-off-by: Yuan Can <yuancan@...wei.com>
---
Changes in v3:
- Introduce more error handling path to handle vsi->netdev
- Rely on error path of i40e_probe() instead of do all cleanup in
  i40e_init_recovery_mode() to make sure pf->qp_pile is not leaked

Changes in v2:
- Add net in patch title
- Add Leon Romanovsky's reviewed by

 drivers/net/ethernet/intel/i40e/i40e_main.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index b5dcd15ced36..d1aadd298ea7 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -15511,13 +15511,13 @@ static int i40e_init_recovery_mode(struct i40e_pf *pf, struct i40e_hw *hw)
 		goto err_switch_setup;
 	err = register_netdev(vsi->netdev);
 	if (err)
-		goto err_switch_setup;
+		goto free_netdev;
 	vsi->netdev_registered = true;
 	i40e_dbg_pf_init(pf);
 
 	err = i40e_setup_misc_vector_for_recovery_mode(pf);
 	if (err)
-		goto err_switch_setup;
+		goto unreg_netdev;
 
 	/* tell the firmware that we're starting */
 	i40e_send_version(pf);
@@ -15528,15 +15528,15 @@ static int i40e_init_recovery_mode(struct i40e_pf *pf, struct i40e_hw *hw)
 
 	return 0;
 
+unreg_netdev:
+	unregister_netdev(vsi->netdev);
+free_netdev:
+	free_netdev(vsi->netdev);
 err_switch_setup:
 	i40e_reset_interrupt_capability(pf);
 	del_timer_sync(&pf->service_timer);
 	i40e_shutdown_adminq(hw);
-	iounmap(hw->hw_addr);
-	pci_disable_pcie_error_reporting(pf->pdev);
-	pci_release_mem_regions(pf->pdev);
-	pci_disable_device(pf->pdev);
-	kfree(pf);
+	kfree(pf->vsi);
 
 	return err;
 }
@@ -15789,8 +15789,11 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err_sw_init;
 	}
 
-	if (test_bit(__I40E_RECOVERY_MODE, pf->state))
-		return i40e_init_recovery_mode(pf, hw);
+	if (test_bit(__I40E_RECOVERY_MODE, pf->state)) {
+		err = i40e_init_recovery_mode(pf, hw);
+		if (err)
+			goto err_init_lan_hmc;
+	}
 
 	err = i40e_init_lan_hmc(hw, hw->func_caps.num_tx_qp,
 				hw->func_caps.num_rx_qp, 0, 0);
-- 
2.17.1