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authorMartin Murray <murrayma@citi.umich.edu>2006-01-10 21:02:29 -0800
committerChris Wright <chrisw@sous-sol.org>2006-01-14 22:15:30 -0800
commit7abeff5a23abb2d0edc54cc1cc3acaf886ea98ca (patch)
treee1f1d2494dea12570bc56913501669cc162ae2d4
parent15ee2e069481ce6de3523e4effeddd44c61cc65a (diff)
downloadlinux-linaro-stable-7abeff5a23abb2d0edc54cc1cc3acaf886ea98ca.tar.gz
[PATCH] Fix DoS in netlink_rcv_skb() (CVE-2006-0035)
Sanity check nlmsg_len during netlink_rcv_skb. An nlmsg_len == 0 can cause infinite loop in kernel, effectively DoSing machine. Noted by Martin Murray. Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/netlink/af_netlink.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index a002f2b686f2..fc5a735ba0ac 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -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);