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netfilter: nf_tables: perform flags validation before table allocation 

Simplifies error handling. Additionally use the correct type u32 for the
host byte order flags value.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-01-09 18:42:39 +00:00 committed by Pablo Neira Ayuso
parent fa2c1de0bb
commit c5c1f975ad
1 changed files with 9 additions and 13 deletions
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22
net/netfilter/nf_tables_api.c
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@ -366,7 +366,7 @@ static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb,
int family = nfmsg->nfgen_family, ret = 0;
if (nla[NFTA_TABLE_FLAGS]) {
__be32 flags;
u32 flags;
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_DORMANT)
@ -402,6 +402,7 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
struct nft_table *table;
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
u32 flags = 0;
afi = nf_tables_afinfo_lookup(net, family, true);
if (IS_ERR(afi))
@ -423,6 +424,12 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
return nf_tables_updtable(nlsk, skb, nlh, nla, afi, table);
}
if (nla[NFTA_TABLE_FLAGS]) {
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_DORMANT)
return -EINVAL;
}
table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
if (table == NULL)
return -ENOMEM;
@ -430,18 +437,7 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
nla_strlcpy(table->name, name, nla_len(name));
INIT_LIST_HEAD(&table->chains);
INIT_LIST_HEAD(&table->sets);
if (nla[NFTA_TABLE_FLAGS]) {
__be32 flags;
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_DORMANT) {
kfree(table);
return -EINVAL;
}
table->flags |= flags;
}
table->flags = flags;
list_add_tail(&table->list, &afi->tables);
nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family);