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cn: verify msg->len before making callback

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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@oracle.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: David Fries <David@Fries.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Fries 2014-11-10 20:19:36 -06:00 • committed by Greg Kroah-Hartman
parent 55c4e6405d
commit a30cfa475d
1 changed files with 6 additions and 0 deletions
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6
drivers/connector/connector.c
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@ -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)) {