Commit d4bb5caa authored by Aaron Conole's avatar Aaron Conole Committed by Pablo Neira Ayuso

netfilter: Only allow sane values in nf_register_net_hook

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: default avatarAaron Conole <aconole@bytheb.org>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent e2361cb9
...@@ -89,6 +89,11 @@ int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg) ...@@ -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_entry *entry;
struct nf_hook_ops *elem; 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); entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) if (!entry)
return -ENOMEM; return -ENOMEM;
......
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