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net/sched: act_tunnel_key: Fix double free dst_cache

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dst_cache_destroy will be called in dst_release

dst_release-->dst_destroy_rcu-->dst_destroy-->metadata_dst_free
-->dst_cache_destroy

It should not call dst_cache_destroy before dst_release

Fixes: 41411e2fd6b8 ("net/sched: act_tunnel_key: Add dst_cache support")
Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wenxu 2019-03-05 08:29:28 +08:00 committed by David S. Miller
parent 0e63208915
commit 4177c5d942
1 changed files with 6 additions and 16 deletions
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22
net/sched/act_tunnel_key.c
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@ -201,14 +201,9 @@ static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
{
if (!p)
return;
if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
#ifdef CONFIG_DST_CACHE
struct ip_tunnel_info *info = &p->tcft_enc_metadata->u.tun_info;
dst_cache_destroy(&info->dst_cache);
#endif
if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
dst_release(&p->tcft_enc_metadata->dst);
}
kfree_rcu(p, rcu);
}
@ -338,7 +333,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
&metadata->u.tun_info,
opts_len, extack);
if (ret < 0)
goto release_dst_cache;
goto release_tun_meta;
}
metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
@ -354,14 +349,14 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
&act_tunnel_key_ops, bind, true);
if (ret) {
NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
goto release_dst_cache;
goto release_tun_meta;
}
ret = ACT_P_CREATED;
} else if (!ovr) {
NL_SET_ERR_MSG(extack, "TC IDR already exists");
ret = -EEXIST;
goto release_dst_cache;
goto release_tun_meta;
}
t = to_tunnel_key(*a);
@ -371,7 +366,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
ret = -ENOMEM;
exists = true;
goto release_dst_cache;
goto release_tun_meta;
}
params_new->tcft_action = parm->t_action;
params_new->tcft_enc_metadata = metadata;
@ -388,12 +383,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
return ret;
release_dst_cache:
#ifdef CONFIG_DST_CACHE
if (metadata)
dst_cache_destroy(&metadata->u.tun_info.dst_cache);
release_tun_meta:
#endif
if (metadata)
dst_release(&metadata->dst);