interface: fix NULL pointer defref in interface_set_main_dev

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/interface.c b/interface.c
index 81de337e05d5347724ace34b531a98e59839815d..ddbdca9122a9ce1e1b00b3a70d442cb53d4260b8 100644 (file)
--- a/interface.c
+++ b/interface.c
@@ -675,6 +675,9 @@ interface_set_main_dev(struct interface *iface, struct device *dev)
                interface_set_l3_dev(iface, dev);
 
        device_add_user(&iface->main_dev, dev);
+       if (!dev)
+               return;
+
        if (claimed)
                device_claim(&iface->l3_dev);