linux-kernel - [PATCH] ethernet: e1000e: Fix possible uninit bug

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Message-Id: <20230710005736.3273464-1-yhao016@ucr.edu>
Date:   Sun,  9 Jul 2023 17:57:35 -0700
From:   Yu Hao <yhao016@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Yu Hao <yhao016@....edu>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ethernet: e1000e: Fix possible uninit bug

The variable phy_data should be initialized in function e1e_rphy.
However, there is not return value check, which means there is a
possible uninit read later for the variable.

Signed-off-by: Yu Hao <yhao016@....edu>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 771a3c909c45..a807358a8174 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -6909,7 +6909,7 @@ static int __e1000_resume(struct pci_dev *pdev)
 
 	/* report the system wakeup cause from S3/S4 */
 	if (adapter->flags2 & FLAG2_HAS_PHY_WAKEUP) {
-		u16 phy_data;
+		u16 phy_data = 0;
 
 		e1e_rphy(&adapter->hw, BM_WUS, &phy_data);
 		if (phy_data) {
-- 
2.34.1