openvswitch: Fix double-free on ip_defrag() errors

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: 7f8a436eaa2c ("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>

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 0bf0f40..dba635d 100644 (file)
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -1109,8 +1109,8 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
                                             nla_data(a));
 
                        /* Hide stolen IP fragments from user space. */
-                       if (err == -EINPROGRESS)
-                               return 0;
+                       if (err)
+                               return err == -EINPROGRESS ? 0 : err;
                        break;
                }
 

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index a5ec34f..b5dcc0a 100644 (file)
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -293,6 +293,9 @@ static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
        return helper->help(skb, protoff, ct, ctinfo);
 }
 
+/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
+ * value if 'skb' is freed.
+ */
 static int handle_fragments(struct net *net, struct sw_flow_key *key,
                            u16 zone, struct sk_buff *skb)
 {
@@ -308,8 +311,8 @@ static int handle_fragments(struct net *net, struct sw_flow_key *key,
                        return err;
 
                ovs_cb.mru = IPCB(skb)->frag_max_size;
-       } else if (key->eth.type == htons(ETH_P_IPV6)) {
 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
+       } else if (key->eth.type == htons(ETH_P_IPV6)) {
                enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
                struct sk_buff *reasm;
 
@@ -318,17 +321,18 @@ static int handle_fragments(struct net *net, struct sw_flow_key *key,
                if (!reasm)
                        return -EINPROGRESS;
 
-               if (skb == reasm)
+               if (skb == reasm) {
+                       kfree_skb(skb);
                        return -EINVAL;
+               }
 
                key->ip.proto = ipv6_hdr(reasm)->nexthdr;
                skb_morph(skb, reasm);
                consume_skb(reasm);
                ovs_cb.mru = IP6CB(skb)->frag_max_size;
-#else
-               return -EPFNOSUPPORT;
 #endif
        } else {
+               kfree_skb(skb);
                return -EPFNOSUPPORT;
        }
 
@@ -473,6 +477,9 @@ static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
        return false;
 }
 
+/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
+ * value if 'skb' is freed.
+ */
 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
                   struct sw_flow_key *key,
                   const struct ovs_conntrack_info *info)
@@ -508,6 +515,8 @@ int ovs_ct_execute(struct net *net, struct sk_buff *skb,
                                        &info->labels.mask);
 err:
        skb_push(skb, nh_ofs);
+       if (err)
+               kfree_skb(skb);
        return err;
 }
 

diff --git a/net/openvswitch/conntrack.h b/net/openvswitch/conntrack.h
index 82e0dfc..a7544f4 100644 (file)
--- a/net/openvswitch/conntrack.h
+++ b/net/openvswitch/conntrack.h
@@ -67,6 +67,7 @@ static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
                                 struct sw_flow_key *key,
                                 const struct ovs_conntrack_info *info)
 {
+       kfree_skb(skb);
        return -ENOTSUPP;
 }