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net: dsa: mv88e6xxx: Fix opps when adding vlan bridge 

A port is not necessarily assigned to a netdev. And a port does not
need to be a member of a bridge. So when iterating over all ports,
check before using the netdev and bridge_dev for a port. Otherwise we
dereference a NULL pointer.

Fixes: da9c359e19 ("net: dsa: mv88e6xxx: check hardware VLAN in use")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Andrew Lunn 2016-12-11 21:07:19 +01:00 committed by David S. Miller
parent e28ceeb10c
commit 66e2809dd3
1 changed files with 6 additions and 0 deletions
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6
drivers/net/dsa/mv88e6xxx/chip.c
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@ -1775,6 +1775,9 @@ static int mv88e6xxx_port_check_hw_vlan(struct dsa_switch *ds, int port,
if (dsa_is_dsa_port(ds, i) || dsa_is_cpu_port(ds, i))
continue;
if (!ds->ports[port].netdev)
continue;
if (vlan.data[i] ==
GLOBAL_VTU_DATA_MEMBER_TAG_NON_MEMBER)
continue;
@ -1783,6 +1786,9 @@ static int mv88e6xxx_port_check_hw_vlan(struct dsa_switch *ds, int port,
chip->ports[port].bridge_dev)
break; /* same bridge, check next VLAN */
if (!chip->ports[i].bridge_dev)
continue;
netdev_warn(ds->ports[port].netdev,
"hardware VLAN %d already used by %s\n",
vlan.vid,