ifplugd: if SIOCSIFFLAGS fails with ENODEV, don't die

Some user managed to hit a race where iface is gone between SIOCGIFFLAGS
and SIOCSIFFLAGS (!). If SIOCSIFFLAGS fails, treat it the same as failed
SIOCGIFFLAGS

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/networking/ifplugd.c b/networking/ifplugd.c
index 28c49e218..029cba147 100644
--- a/networking/ifplugd.c
+++ b/networking/ifplugd.c
@@ -358,8 +358,12 @@ static void up_iface(void)
                 ifrequest.ifr_flags |= IFF_UP;
                 /* Let user know we mess up with interface */
                 bb_error_msg("upping interface");
-                if (network_ioctl(SIOCSIFFLAGS, &ifrequest, "setting interface flags") < 0)
-                        xfunc_die();
+                if (network_ioctl(SIOCSIFFLAGS, &ifrequest, "setting interface flags") < 0) {
+                        if (errno != ENODEV)
+                                xfunc_die();
+                        G.iface_exists = 0;
+                        return;
+                }
         }
 
 #if 0 /* why do we mess with IP addr? It's not our business */