Commit ad8e4b75 authored Jan 10, 2006 by Martin Murray Committed by David S. Miller Jan 10, 2006

[AF_NETLINK]: Fix DoS in netlink_rcv_skb()



From: Martin Murray <murrayma@citi.umich.edu>

Sanity check nlmsg_len during netlink_rcv_skb.  An nlmsg_len == 0 can
cause infinite loop in kernel, effectively DoSing machine.  Noted by
Matin Murray.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent babbdb1a

net/netlink/af_netlink.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1422,7 +1422,7 @@ static int netlink_rcv_skb(struct sk_buff skb, int (cb)(struct sk_buff *,
		while (skb->len >= nlmsg_total_size(0)) {
		nlh = (struct nlmsghdr *) skb->data;

		if (skb->len < nlh->nlmsg_len)
		if (nlh->nlmsg_len < NLMSG_HDRLEN \|\| skb->len < nlh->nlmsg_len)
		return 0;

		total_len = min(NLMSG_ALIGN(nlh->nlmsg_len), skb->len);