netdev - [PATCH net 9/9] igb: Fix potential invalid memory access in igb_init

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Message-ID: <20241203215521.1646668-10-anthony.l.nguyen@intel.com>
Date: Tue,  3 Dec 2024 13:55:18 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Yuan Can <yuancan@...wei.com>,
	anthony.l.nguyen@...el.com,
	przemyslaw.kitszel@...el.com,
	Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com>
Subject: [PATCH net 9/9] igb: Fix potential invalid memory access in igb_init_module()

From: Yuan Can <yuancan@...wei.com>

The pci_register_driver() can fail and when this happened, the dca_notifier
needs to be unregistered, otherwise the dca_notifier can be called when
igb fails to install, resulting to invalid memory access.

Fixes: bbd98fe48a43 ("igb: Fix DCA errors and do not use context index for 82576")
Signed-off-by: Yuan Can <yuancan@...wei.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 08578980b651..288a4bb2683a 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -637,6 +637,10 @@ static int __init igb_init_module(void)
 	dca_register_notify(&dca_notifier);
 #endif
 	ret = pci_register_driver(&igb_driver);
+#ifdef CONFIG_IGB_DCA
+	if (ret)
+		dca_unregister_notify(&dca_notifier);
+#endif
 	return ret;
 }
 
-- 
2.42.0