From 93c0c8b4a5a174645550d444bd5c3ff0cccf74cb Mon Sep 17 00:00:00 2001 From: Stefan Schmidt <stefan@datenfreihafen.org> Date: Mon, 26 Apr 2010 11:20:32 -0700 Subject: [PATCH] ieee802154: Fix oops during ieee802154_sock_ioctl Trying to run izlisten (from lowpan-tools tests) on a device that does not exists I got the oops below. The problem is that we are using get_dev_by_name without checking if we really get a device back. We don't in this case and writing to dev->type generates this oops. [Oops code removed by Dmitry Eremin-Solenikov] If possible this patch should be applied to the current -rc fixes branch. Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- net/ieee802154/af_ieee802154.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ieee802154/af_ieee802154.c b/net/ieee802154/af_ieee802154.c index c7da600750bb..93c91b633a56 100644 --- a/net/ieee802154/af_ieee802154.c +++ b/net/ieee802154/af_ieee802154.c @@ -151,6 +151,9 @@ static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg, dev_load(sock_net(sk), ifr.ifr_name); dev = dev_get_by_name(sock_net(sk), ifr.ifr_name); + if (!dev) + return -ENODEV; + if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl) ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);