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Diffstat (limited to 'net/dsa/dsa_priv.h')
-rw-r--r--net/dsa/dsa_priv.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 70de7895e5b8..053731473c99 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -126,6 +126,7 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
struct dsa_port *cpu_dp = dev->dsa_ptr;
struct dsa_switch_tree *dst = cpu_dp->dst;
struct dsa_switch *ds;
+ struct dsa_port *slave_port;
if (device < 0 || device >= DSA_MAX_SWITCHES)
return NULL;
@@ -137,7 +138,12 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
if (port < 0 || port >= ds->num_ports)
return NULL;
- return ds->ports[port].slave;
+ slave_port = &ds->ports[port];
+
+ if (unlikely(slave_port->type != DSA_PORT_TYPE_USER))
+ return NULL;
+
+ return slave_port->slave;
}
/* port.c */