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

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Message-ID: <20241022063807.37561-1-yuancan@huawei.com>
Date: Tue, 22 Oct 2024 14:38:07 +0800
From: Yuan Can <yuancan@...wei.com>
To: <anthony.l.nguyen@...el.com>, <przemyslaw.kitszel@...el.com>,
	<andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <cramerj@...el.com>,
	<shannon.nelson@....com>, <mitch.a.williams@...el.com>, <jgarzik@...hat.com>,
	<auke-jan.h.kok@...el.com>, <intel-wired-lan@...ts.osuosl.org>,
	<netdev@...r.kernel.org>
CC: <yuancan@...wei.com>
Subject: [PATCH] igb: Fix potential invalid memory access in igb_init_module()

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: fe4506b6a2f9 ("igb: add DCA support")
Signed-off-by: Yuan Can <yuancan@...wei.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 f1d088168723..18284a838e24 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;
 }
 
-- 
2.17.1