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netfilter: limit the length of the helper name

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This is necessary in order to have an upper bound for Netlink
message calculation, which is not a problem at all, as there
are no helpers with a longer name.

Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Holger Eitzenberger 2009-03-25 18:44:01 +01:00 committed by Patrick McHardy
parent e487eb99cf
commit af9d32ad67
2 changed files with 3 additions and 0 deletions
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2
include/net/netfilter/nf_conntrack_helper.h
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@ -14,6 +14,8 @@
struct module;
#define NF_CT_HELPER_NAME_LEN 16
struct nf_conntrack_helper
{
struct hlist_node hnode; /* Internal use. */

1
net/netfilter/nf_conntrack_helper.c
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@ -142,6 +142,7 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
BUG_ON(me->expect_policy == NULL);
BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES);
BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1);
mutex_lock(&nf_ct_helper_mutex);
hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]);