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fib_frontend: fix possible NULL pointer dereference 

The two commits 0115e8e30d (net: remove delay at device dismantle) and
748e2d9396 (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>
This commit is contained in:
Oliver Hartkopp 2014-01-23 10:19:34 +01:00 committed by David S. Miller
parent 322b1f79da
commit a0065f266a
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/fib_frontend.c
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@ -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: