Commit a0065f26 authored Jan 23, 2014 by Oliver Hartkopp Committed by David S. Miller Jan 24, 2014

fib_frontend: fix possible NULL pointer dereference



The two commits 0115e8e3 (net: remove delay at device dismantle) and
748e2d93 (net: reinstate rtnl in call_netdevice_notifiers()) silently
removed a NULL pointer check for in_dev since Linux 3.7.

This patch re-introduces this check as it causes crashing the kernel when
setting small mtu values on non-ip capable netdevices.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 322b1f79

net/ipv4/fib_frontend.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1047,6 +1047,8 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
		}

		in_dev = __in_dev_get_rtnl(dev);
		if (!in_dev)
		return NOTIFY_DONE;

		switch (event) {
		case NETDEV_UP: