netdev - [PATCH stable 3.7+] fib_frontend: fix possible NULL pointer dereference

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Message-ID: <52E0DEA6.3060803@hartkopp.net>
Date:	Thu, 23 Jan 2014 10:19:34 +0100
From:	Oliver Hartkopp <socketcan@...tkopp.net>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: [PATCH stable 3.7+] fib_frontend: fix possible NULL pointer dereference

The two commits 0115e8e30d (net: remove delay at device dismantle) and
748e2d9396a (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@...tkopp.net>

---

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index d846304..c7539e2 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -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:


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