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[nf-next,v3,5/7] nf_register_net_hook: Only allow sane values

Message ID 1474472107-12992-6-git-send-email-aconole@bytheb.org
State Accepted
Delegated to: Pablo Neira
Headers show

Commit Message

Aaron Conole Sept. 21, 2016, 3:35 p.m. UTC 
This commit adds an upfront check for sane values to be passed when
registering a netfilter hook.  This will be used in a future patch for a
simplified hook list traversal.

Signed-off-by: Aaron Conole <aconole@bytheb.org>
---
 net/netfilter/core.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index c8faf81..67b7428 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -89,6 +89,11 @@  int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
 	struct nf_hook_entry *entry;
 	struct nf_hook_ops *elem;
 
+	if (reg->pf == NFPROTO_NETDEV &&
+	    (reg->hooknum != NF_NETDEV_INGRESS ||
+	     !reg->dev || dev_net(reg->dev) != net))
+		return -EINVAL;
+
 	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry)
 		return -ENOMEM;