system-linux: check ioctl return value in system_vlan()

[project/netifd.git] / system-linux.c

diff --git a/system-linux.c b/system-linux.c
index 0b594f6..9b654d1 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -1250,7 +1250,8 @@ static int system_vlan(struct device *dev, int id)
                .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
        };
 
-       ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
+       if (ioctl(sock_ioctl, SIOCSIFVLAN, &ifr) < 0)
+               return -1;
 
        if (id < 0) {
                ifr.cmd = DEL_VLAN_CMD;