From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: kaber@trash.net
Subject: [PATCH nf 1/3] netfilter: nfnetlink: validate nfnetlink header from batch
Date: Mon, 5 Jan 2015 12:06:25 +0100 [thread overview]
Message-ID: <1420455986-5800-1-git-send-email-pablo@netfilter.org> (raw)
Make sure there is enough room for the nfnetlink header in the
netlink messages that are part of the batch. There is a similar
check in netlink_rcv_skb().
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nfnetlink.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 13c2e17..c6619d4 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -321,7 +321,8 @@ replay:
nlh = nlmsg_hdr(skb);
err = 0;
- if (nlh->nlmsg_len < NLMSG_HDRLEN) {
+ if (nlmsg_len(nlh) < sizeof(struct nfgenmsg) ||
+ skb->len < nlh->nlmsg_len) {
err = -EINVAL;
goto ack;
}
--
1.7.10.4
next reply other threads:[~2015-01-05 11:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-05 11:06 Pablo Neira Ayuso [this message]
2015-01-05 11:06 ` [PATCH nf 2/3] netfilter: nfnetlink: relax strict multicast group from netlink_bind Pablo Neira Ayuso
2015-01-05 11:22 ` Patrick McHardy
2015-01-05 11:41 ` Pablo Neira Ayuso
2015-01-05 11:43 ` Patrick McHardy
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