[PATCH 4.20 41/76] net: phy: phylink: fix uninitialized variable in phylink_get_mac_state

Greg Kroah-Hartman
2019-03-08T13:06:47Z

From: Heiner Kallweit <hkallweit1@gmail.com>

[ Upstream commit d25ed413d5e51644e18f66e34eec049f17a7abcb ]

When debugging an issue I found implausible values in state->pause.
Reason in that state->pause isn't initialized and later only single
bits are changed. Also the struct itself isn't initialized in
phylink_resolve(). So better initialize state->pause and other
not yet initialized fields.

v2:
- use right function name in subject
v3:
- initialize additional fields

Fixes: 9525ae83959b ("phylink: add phylink infrastructure")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/phy/phylink.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -321,6 +321,10 @@ static int phylink_get_mac_state(struct
linkmode_zero(state->lp_advertising);
state->interface = pl->link_config.interface;
state->an_enabled = pl->link_config.an_enabled;
+ state->speed = SPEED_UNKNOWN;
+ state->duplex = DUPLEX_UNKNOWN;
+ state->pause = MLO_PAUSE_NONE;
+ state->an_complete = 0;
state->link = 1;

return pl->ops->mac_link_state(ndev, state);