netdev - [PATCH] net: netxen: fix a missing check and an uninitialized use

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Message-Id: <20181221062232.59789-1-kjlu@umn.edu>
Date:   Fri, 21 Dec 2018 00:22:32 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Manish Chopra <manish.chopra@...ium.com>,
        Rahul Verma <rahul.verma@...ium.com>,
        Dept-GELinuxNICDev@...ium.com,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: netxen: fix a missing check and an uninitialized use

When netxen_rom_fast_read() fails, "bios" is left uninitialized and may
contain random value, thus should not be used.

The fix ensures that if netxen_rom_fast_read() fails, we return "-EIO".

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
index 0ea141ece19e..6547a9dd5935 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
@@ -1125,7 +1125,8 @@ netxen_validate_firmware(struct netxen_adapter *adapter)
 		return -EINVAL;
 	}
 	val = nx_get_bios_version(adapter);
-	netxen_rom_fast_read(adapter, NX_BIOS_VERSION_OFFSET, (int *)&bios);
+	if (netxen_rom_fast_read(adapter, NX_BIOS_VERSION_OFFSET, (int *)&bios))
+		return -EIO;
 	if ((__force u32)val != bios) {
 		dev_err(&pdev->dev, "%s: firmware bios is incompatible\n",
 				fw_name[fw_type]);
-- 
2.17.2 (Apple Git-113)