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74c1661813
If ip_defrag() returns an error other than -EINPROGRESS, then the skb is
freed. When handle_fragments() passes this back up to
do_execute_actions(), it will be freed again. Prevent this double free
by never freeing the skb in do_execute_actions() for errors returned by
ovs_ct_execute. Always free it in ovs_ct_execute() error paths instead.
Fixes: 7f8a436eaa ("openvswitch: Add conntrack action")
Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* Copyright (c) 2015 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef OVS_CONNTRACK_H
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#define OVS_CONNTRACK_H 1
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#include "flow.h"
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struct ovs_conntrack_info;
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enum ovs_key_attr;
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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void ovs_ct_init(struct net *);
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void ovs_ct_exit(struct net *);
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bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
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int ovs_ct_copy_action(struct net *, const struct nlattr *,
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const struct sw_flow_key *, struct sw_flow_actions **,
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bool log);
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int ovs_ct_action_to_attr(const struct ovs_conntrack_info *, struct sk_buff *);
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int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
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const struct ovs_conntrack_info *);
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void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
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int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb);
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void ovs_ct_free_action(const struct nlattr *a);
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#define CT_SUPPORTED_MASK (OVS_CS_F_NEW | OVS_CS_F_ESTABLISHED | \
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OVS_CS_F_RELATED | OVS_CS_F_REPLY_DIR | \
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OVS_CS_F_INVALID | OVS_CS_F_TRACKED)
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#else
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#include <linux/errno.h>
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static inline void ovs_ct_init(struct net *net) { }
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static inline void ovs_ct_exit(struct net *net) { }
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static inline bool ovs_ct_verify(struct net *net, int attr)
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{
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return false;
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}
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static inline int ovs_ct_copy_action(struct net *net, const struct nlattr *nla,
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const struct sw_flow_key *key,
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struct sw_flow_actions **acts, bool log)
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{
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return -ENOTSUPP;
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}
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static inline int ovs_ct_action_to_attr(const struct ovs_conntrack_info *info,
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struct sk_buff *skb)
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{
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return -ENOTSUPP;
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}
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static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
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struct sw_flow_key *key,
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const struct ovs_conntrack_info *info)
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{
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kfree_skb(skb);
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return -ENOTSUPP;
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}
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static inline void ovs_ct_fill_key(const struct sk_buff *skb,
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struct sw_flow_key *key)
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{
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key->ct.state = 0;
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key->ct.zone = 0;
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key->ct.mark = 0;
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memset(&key->ct.labels, 0, sizeof(key->ct.labels));
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}
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static inline int ovs_ct_put_key(const struct sw_flow_key *key,
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struct sk_buff *skb)
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{
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return 0;
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}
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static inline void ovs_ct_free_action(const struct nlattr *a) { }
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#define CT_SUPPORTED_MASK 0
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#endif /* CONFIG_NF_CONNTRACK */
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#endif /* ovs_conntrack.h */
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