[PATCH 20/23] netfilter: nf_tables: take AF module reference when creating a table
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2014-01-10 00:35:39
Also in:
netfilter-devel
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Patrick McHardy <redacted> The table refers to data of the AF module, so we need to make sure the module isn't unloaded while the table exists. Signed-off-by: Patrick McHardy <redacted> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- net/netfilter/nf_tables_api.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 88f9c94..c352614 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c@@ -430,9 +430,14 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, return -EINVAL; } + if (!try_module_get(afi->owner)) + return -EAFNOSUPPORT; + table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); - if (table == NULL) + if (table == NULL) { + module_put(afi->owner); return -ENOMEM; + } nla_strlcpy(table->name, name, nla_len(name)); INIT_LIST_HEAD(&table->chains);
@@ -468,6 +473,7 @@ static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, list_del(&table->list); nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); kfree(table); + module_put(afi->owner); return 0; }
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1.7.10.4