Commit 75c689dc authored by Gao Feng's avatar Gao Feng Committed by Pablo Neira Ayuso

netfilter: nf_nat_snmp: Fix panic when snmp_trap_helper fails to register

In the commit 93557f53 ("netfilter: nf_conntrack: nf_conntrack snmp
helper"), the snmp_helper is replaced by nf_nat_snmp_hook. So the
snmp_helper is never registered. But it still tries to unregister the
snmp_helper, it could cause the panic.

Now remove the useless snmp_helper and the unregister call in the
error handler.

Fixes: 93557f53 ("netfilter: nf_conntrack: nf_conntrack snmp helper")
Signed-off-by: default avatarGao Feng <fgao@ikuai8.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 9c3f3794
......@@ -1260,16 +1260,6 @@ static const struct nf_conntrack_expect_policy snmp_exp_policy = {
.timeout = 180,
};
static struct nf_conntrack_helper snmp_helper __read_mostly = {
.me = THIS_MODULE,
.help = help,
.expect_policy = &snmp_exp_policy,
.name = "snmp",
.tuple.src.l3num = AF_INET,
.tuple.src.u.udp.port = cpu_to_be16(SNMP_PORT),
.tuple.dst.protonum = IPPROTO_UDP,
};
static struct nf_conntrack_helper snmp_trap_helper __read_mostly = {
.me = THIS_MODULE,
.help = help,
......@@ -1288,17 +1278,10 @@ static struct nf_conntrack_helper snmp_trap_helper __read_mostly = {
static int __init nf_nat_snmp_basic_init(void)
{
int ret = 0;
BUG_ON(nf_nat_snmp_hook != NULL);
RCU_INIT_POINTER(nf_nat_snmp_hook, help);
ret = nf_conntrack_helper_register(&snmp_trap_helper);
if (ret < 0) {
nf_conntrack_helper_unregister(&snmp_helper);
return ret;
}
return ret;
return nf_conntrack_helper_register(&snmp_trap_helper);
}
static void __exit nf_nat_snmp_basic_fini(void)
......
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