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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: Aaron Conole <aconole@bytheb.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Aaron Conole 2016-09-21 11:35:05 -04:00 committed by Pablo Neira Ayuso
parent e2361cb90a
commit d4bb5caa9c
1 changed files with 5 additions and 0 deletions
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5
net/netfilter/core.c
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@ -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;