[PATCH AUTOSEL 4.9 34/35] net: netxen: fix a missing check and an uninitialized use

[Sasha Levin]

From: Kangjie Lu <kjlu@xxxxxxx>

[ Upstream commit d134e486e831defd26130770181f01dfc6195f7d ]

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@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 7b43a3b4abdc..5cf551914767 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]);
-- 
2.19.1