From: Yuan Can <yuancan@huawei.com>
Date: Wed, 23 Oct 2024 12:10:48 +0000 (+0800)
Subject: igb: Fix potential invalid memory access in igb_init_module()
X-Git-Tag: v6.13-rc2~24^2~4^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0566f83d206c7a864abcd741fe39d6e0ae5eef29;p=thirdparty%2Flinux.git

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: bbd98fe48a43 ("igb: Fix DCA errors and do not use context index for 82576")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 08578980b6518..288a4bb2683a9 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;
 }