netdev - [PATCH net 2/2] octeontx2-vf: Fix possible memory leak in otx2vf

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Date:   Thu, 24 Nov 2022 09:56:56 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <sgoutham@...vell.com>, <gakula@...vell.com>,
        <sbhatta@...vell.com>, <hkelam@...vell.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>
CC:     <naveenm@...vell.com>, <rsaladi2@...vell.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net 2/2] octeontx2-vf: Fix possible memory leak in otx2vf_probe()

In otx2vf_probe(), there are several possible memory leak bugs
in exception paths as follows:
1. Do not release vf->otx2_wq when excute otx2vf_mcam_flow_init() and
   otx2_init_tc() failed.
2. Do not unregister devlink when excute otx2_dcbnl_set_ops() failed.

Fixes: 4b0385bc8e6a ("octeontx2-pf: Add TC feature for VFs")
Fixes: 8e67558177f8 ("octeontx2-pf: PFC config support with DCBx")
Fixes: 3cffaed2136c ("octeontx2-pf: Ntuple filters support for VF netdev")
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index 86653bb8e403..f1b47fecd379 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -684,11 +684,11 @@ static int otx2vf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	err = otx2vf_mcam_flow_init(vf);
 	if (err)
-		goto err_unreg_netdev;
+		goto err_destroy_wq;
 
 	err = otx2_init_tc(vf);
 	if (err)
-		goto err_unreg_netdev;
+		goto err_destroy_wq;
 
 	err = otx2_register_dl(vf);
 	if (err)
@@ -697,13 +697,19 @@ static int otx2vf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 #ifdef CONFIG_DCB
 	err = otx2_dcbnl_set_ops(netdev);
 	if (err)
-		goto err_shutdown_tc;
+		goto err_unreg_dl;
 #endif
 
 	return 0;
 
+#ifdef CONFIG_DCB
+err_unreg_dl:
+	otx2_unregister_dl(vf);
+#endif
 err_shutdown_tc:
 	otx2_shutdown_tc(vf);
+err_destroy_wq:
+	destroy_workqueue(vf->otx2_wq);
 err_unreg_netdev:
 	unregister_netdev(netdev);
 err_ptp_destroy:
-- 
2.25.1