netfilter: ipt_CLUSTERIP: fix refcount leak in clusterip_tg_check()
The issue takes place in one error path of clusterip_tg_check(). When
memcmp() returns nonzero, the function simply returns the error code,
forgetting to decrease the reference count of a clusterip_config
object, which is bumped earlier by clusterip_config_find_get(). This
may incur reference count leak.
Fix this issue by decrementing the refcount of the object in specific
error path.
Fixes: 06aa151ad1fc74 ("netfilter: ipt_CLUSTERIP: check MAC address when duplicate config is set")
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index 8fd1aba..b518f20 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -520,8 +520,11 @@ static int clusterip_tg_check(const struct xt_tgchk_param *par)
if (IS_ERR(config))
return PTR_ERR(config);
}
- } else if (memcmp(&config->clustermac, &cipinfo->clustermac, ETH_ALEN))
+ } else if (memcmp(&config->clustermac, &cipinfo->clustermac, ETH_ALEN)) {
+ clusterip_config_entry_put(config);
+ clusterip_config_put(config);
return -EINVAL;
+ }
ret = nf_ct_netns_get(par->net, par->family);
if (ret < 0) {