When e1000_read_kmrn_reg_80003es2lan() fails, "kum_reg_data" is
uninitialized and may contain random value. However, it is further
used in the following execution, which will lead to undefined
behaviors.
The fix checks the failure of e1000_read_kmrn_reg_80003es2lan() and
returns with its error code if it fails.
Signed-off-by: Kangjie Lu <k...@umn.edu>
---
drivers/net/ethernet/intel/e1000e/80003es2lan.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/80003es2lan.c
b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
index 257bd59bc9c6..8a6f8e80e062 100644
--- a/drivers/net/ethernet/intel/e1000e/80003es2lan.c
+++ b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
@@ -754,8 +754,11 @@ static s32 e1000_init_hw_80003es2lan(struct e1000_hw *hw)
return ret_val;
/* Disable IBIST slave mode (far-end loopback) */
- e1000_read_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM,
- &kum_reg_data);
+ ret_val =
+ e1000_read_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM,
+ &kum_reg_data);
+ if (ret_val)
+ return ret_val;
kum_reg_data |= E1000_KMRNCTRLSTA_IBIST_DISABLE;
e1000_write_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM,
kum_reg_data);
--
2.17.1
