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net: dsa: fix phylink_start()/phylink_stop() calls 

Place phylink_start()/phylink_stop() inside dsa_port_enable() and
dsa_port_disable(), which ensures that we call phylink_stop() before
tearing down phylink - which is a documented requirement.  Failure
to do so can cause use-after-free bugs.

Fixes: 0e27921816 ("net: dsa: Use PHYLINK for the CPU/DSA ports")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2020-03-03 15:01:46 +00:00 committed by David S. Miller
parent f650bcd4ef
commit 8640f8dc6d
3 changed files with 30 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/dsa/dsa_priv.h
View File

@ -117,7 +117,9 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
/* port.c */
int dsa_port_set_state(struct dsa_port *dp, u8 state,
struct switchdev_trans *trans);
int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy);
int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy);
void dsa_port_disable_rt(struct dsa_port *dp);
void dsa_port_disable(struct dsa_port *dp);
int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br);
void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br);

32
net/dsa/port.c
View File

@ -63,7 +63,7 @@ static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
}
int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
@ -78,14 +78,31 @@ int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
if (!dp->bridge_dev)
dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
if (dp->pl)
phylink_start(dp->pl);
return 0;
}
void dsa_port_disable(struct dsa_port *dp)
int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
{
int err;
rtnl_lock();
err = dsa_port_enable_rt(dp, phy);
rtnl_unlock();
return err;
}
void dsa_port_disable_rt(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
if (dp->pl)
phylink_stop(dp->pl);
if (!dp->bridge_dev)
dsa_port_set_state_now(dp, BR_STATE_DISABLED);
@ -93,6 +110,13 @@ void dsa_port_disable(struct dsa_port *dp)
ds->ops->port_disable(ds, port);
}
void dsa_port_disable(struct dsa_port *dp)
{
rtnl_lock();
dsa_port_disable_rt(dp);
rtnl_unlock();
}
int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
{
struct dsa_notifier_bridge_info info = {
@ -614,10 +638,6 @@ static int dsa_port_phylink_register(struct dsa_port *dp)
goto err_phy_connect;
}
rtnl_lock();
phylink_start(dp->pl);
rtnl_unlock();
return 0;
err_phy_connect:

8
net/dsa/slave.c
View File

@ -88,12 +88,10 @@ static int dsa_slave_open(struct net_device *dev)
goto clear_allmulti;
}
err = dsa_port_enable(dp, dev->phydev);
err = dsa_port_enable_rt(dp, dev->phydev);
if (err)
goto clear_promisc;
phylink_start(dp->pl);
return 0;
clear_promisc:
@ -114,9 +112,7 @@ static int dsa_slave_close(struct net_device *dev)
struct net_device *master = dsa_slave_to_master(dev);
struct dsa_port *dp = dsa_slave_to_port(dev);
phylink_stop(dp->pl);
dsa_port_disable(dp);
dsa_port_disable_rt(dp);
dev_mc_unsync(master, dev);
dev_uc_unsync(master, dev);