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authorOliver Hartkopp <socketcan@hartkopp.net>2014-01-23 10:19:34 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-06 11:08:16 -0800
commit7dd52e5dcb524d6c4790a415e4d1f47e5bf01616 (patch)
treef7c7580c83d6b1cd14a4b47b6a8a62c132701756 /net
parentb5ac52437d8e34ea8032cfa77d6e6aa4b161aeb5 (diff)
downloadlinaro-lsk-7dd52e5dcb524d6c4790a415e4d1f47e5bf01616.tar.gz
fib_frontend: fix possible NULL pointer dereference
[ Upstream commit a0065f266a9b5d51575535a25c15ccbeed9a9966 ] 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@hartkopp.net> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/fib_frontend.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index c7629a209f9..4556cd25acd 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1049,6 +1049,8 @@ 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: