linux-kernel - [PATCH 1/2] cn: verify msg->len before making callback

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Date:	Mon, 10 Nov 2014 20:19:36 -0600
From:	David Fries <David@...es.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, Evgeniy Polyakov <zbr@...emap.net>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Kees Cook <keescook@...omium.org>
Subject: [PATCH 1/2] cn: verify msg->len before making callback

The struct cn_msg len field comes from userspace and needs to be
validated.  More logical to do so here where the cn_msg pointer is
pulled out of the sk_buff than the callback which is passed cn_msg *
and might assume no validation is needed.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Evgeniy Polyakov <zbr@...emap.net>
Signed-off-by: David Fries <David@...es.net>
---
 drivers/connector/connector.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index f612d68..30f5228 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -141,12 +141,18 @@ EXPORT_SYMBOL_GPL(cn_netlink_send);
  */
 static int cn_call_callback(struct sk_buff *skb)
 {
+	struct nlmsghdr *nlh;
 	struct cn_callback_entry *i, *cbq = NULL;
 	struct cn_dev *dev = &cdev;
 	struct cn_msg *msg = nlmsg_data(nlmsg_hdr(skb));
 	struct netlink_skb_parms *nsp = &NETLINK_CB(skb);
 	int err = -ENODEV;
 
+	/* verify msg->len is within skb */
+	nlh = nlmsg_hdr(skb);
+	if (nlh->nlmsg_len < NLMSG_HDRLEN + sizeof(struct cn_msg) + msg->len)
+		return -EINVAL;
+
 	spin_lock_bh(&dev->cbdev->queue_lock);
 	list_for_each_entry(i, &dev->cbdev->queue_list, callback_entry) {
 		if (cn_cb_equal(&i->id.id, &msg->id)) {
-- 
1.7.10.4

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