Commit a0065f26 authored by Oliver Hartkopp's avatar Oliver Hartkopp Committed by David S. Miller

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: default avatarOliver Hartkopp <socketcan@hartkopp.net>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 322b1f79
...@@ -1047,6 +1047,8 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo ...@@ -1047,6 +1047,8 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
} }
in_dev = __in_dev_get_rtnl(dev); in_dev = __in_dev_get_rtnl(dev);
if (!in_dev)
return NOTIFY_DONE;
switch (event) { switch (event) {
case NETDEV_UP: case NETDEV_UP:
......
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