linux-kernel - [PATCH] ieee802154: Fix oops during ieee802154_sock

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Message-Id: <1272293202-11712-1-git-send-email-dbaryshkov@gmail.com>
Date:	Mon, 26 Apr 2010 18:46:42 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org,
	Stefan Schmidt <stefan@...enfreihafen.org>
Subject: [PATCH] ieee802154: Fix oops during ieee802154_sock_ioctl

From: Stefan Schmidt <stefan@...enfreihafen.org>

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@...enfreihafen.org>
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
---
 net/ieee802154/af_ieee802154.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/ieee802154/af_ieee802154.c b/net/ieee802154/af_ieee802154.c
index bad1c49..72340dd 100644
--- a/net/ieee802154/af_ieee802154.c
+++ b/net/ieee802154/af_ieee802154.c
@@ -147,6 +147,9 @@ 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);
 
-- 
1.7.0

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