From: Andrew Lunn Date: Sun, 11 Dec 2016 20:07:19 +0000 (+0100) Subject: net: dsa: mv88e6xxx: Fix opps when adding vlan bridge X-Git-Tag: v4.14-rc1~1826^2~45 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=66e2809dd324f0ab5e1f9d997b40d4d31a2e42b1;p=platform%2Fkernel%2Flinux-rpi3.git 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: da9c359e19f0 ("net: dsa: mv88e6xxx: check hardware VLAN in use") Signed-off-by: Andrew Lunn Reviewed-by: Vivien Didelot Signed-off-by: David S. Miller --- diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index 4da379f..f7222dc 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -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,