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| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2014-01-23 10:19:34 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-24 15:51:26 -0800 |
| commit | a0065f266a9b5d51575535a25c15ccbeed9a9966 (patch) | |
| tree | 0e935ff454cd02558b88ec10c817ad703598977c /net/ipv4/fib_frontend.c | |
| parent | 322b1f79dacd58cc430bc610b76d6f0ecd5d8874 (diff) | |
| download | linux-a0065f266a9b5d51575535a25c15ccbeed9a9966.tar.gz linux-a0065f266a9b5d51575535a25c15ccbeed9a9966.tar.xz | |
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@hartkopp.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
| -rw-r--r-- | net/ipv4/fib_frontend.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index d846304b7b89..c7539e22868b 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: |