batman-adv: Fix use-after-free/double-free of tt_req_node

The tt_req_node is added and removed from a list inside a spinlock. But the
locking is sometimes removed even when the object is still referenced and
will be used later via this reference. For example batadv_send_tt_request
can create a new tt_req_node (including add to a list) and later
re-acquires the lock to remove it from the list and to free it. But at this
time another context could have already removed this tt_req_node from the
list and freed it.

CPU#0

    batadv_batman_skb_recv from net_device 0
    -> batadv_iv_ogm_receive
      -> batadv_iv_ogm_process
        -> batadv_iv_ogm_process_per_outif
          -> batadv_tvlv_ogm_receive
            -> batadv_tvlv_ogm_receive
              -> batadv_tvlv_containers_process
                -> batadv_tvlv_call_handler
                  -> batadv_tt_tvlv_ogm_handler_v1
                    -> batadv_tt_update_orig
                      -> batadv_send_tt_request
                        -> batadv_tt_req_node_new
                           spin_lock(...)
                           allocates new tt_req_node and adds it to list
                           spin_unlock(...)
                           return tt_req_node

CPU#1

    batadv_batman_skb_recv from net_device 1
    -> batadv_recv_unicast_tvlv
      -> batadv_tvlv_containers_process
        -> batadv_tvlv_call_handler
          -> batadv_tt_tvlv_unicast_handler_v1
            -> batadv_handle_tt_response
               spin_lock(...)
               tt_req_node gets removed from list and is freed
               spin_unlock(...)

CPU#0

                      <- returned to batadv_send_tt_request
                         spin_lock(...)
                         tt_req_node gets removed from list and is freed
                         MEMORY CORRUPTION/SEGFAULT/...
                         spin_unlock(...)

This can only be solved via reference counting to allow multiple contexts
to handle the list manipulation while making sure that only the last
context holding a reference will free the object.

Fixes: a73105b8d4c7 ("batman-adv: improved client announcement mechanism")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Tested-by: Martin Weinelt <martin@darmstadt.freifunk.net>
Tested-by: Amadeus Alfa <amadeus@chemnitz.freifunk.net>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 72abab7b01eb0a31d1083d6fb58ffd2dfacf52a5..cfb5ccdfd62b8f4e1154aa0bc6a03e8654190608 100644 (file)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -2271,6 +2271,29 @@ static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
        return crc;
 }
 
+/**
+ * batadv_tt_req_node_release - free tt_req node entry
+ * @ref: kref pointer of the tt req_node entry
+ */
+static void batadv_tt_req_node_release(struct kref *ref)
+{
+       struct batadv_tt_req_node *tt_req_node;
+
+       tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
+
+       kfree(tt_req_node);
+}
+
+/**
+ * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
+ *  possibly release it
+ * @tt_req_node: tt_req_node to be free'd
+ */
+static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
+{
+       kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
+}
+
 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
 {
        struct batadv_tt_req_node *node;
@@ -2280,7 +2303,7 @@ static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
 
        hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
                hlist_del_init(&node->list);
-               kfree(node);
+               batadv_tt_req_node_put(node);
        }
 
        spin_unlock_bh(&bat_priv->tt.req_list_lock);
@@ -2317,7 +2340,7 @@ static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
                if (batadv_has_timed_out(node->issued_at,
                                         BATADV_TT_REQUEST_TIMEOUT)) {
                        hlist_del_init(&node->list);
-                       kfree(node);
+                       batadv_tt_req_node_put(node);
                }
        }
        spin_unlock_bh(&bat_priv->tt.req_list_lock);
@@ -2349,9 +2372,11 @@ batadv_tt_req_node_new(struct batadv_priv *bat_priv,
        if (!tt_req_node)
                goto unlock;
 
+       kref_init(&tt_req_node->refcount);
        ether_addr_copy(tt_req_node->addr, orig_node->orig);
        tt_req_node->issued_at = jiffies;
 
+       kref_get(&tt_req_node->refcount);
        hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
 unlock:
        spin_unlock_bh(&bat_priv->tt.req_list_lock);
@@ -2615,13 +2640,19 @@ static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
 out:
        if (primary_if)
                batadv_hardif_put(primary_if);
+
        if (ret && tt_req_node) {
                spin_lock_bh(&bat_priv->tt.req_list_lock);
-               /* hlist_del_init() verifies tt_req_node still is in the list */
-               hlist_del_init(&tt_req_node->list);
+               if (!hlist_unhashed(&tt_req_node->list)) {
+                       hlist_del_init(&tt_req_node->list);
+                       batadv_tt_req_node_put(tt_req_node);
+               }
                spin_unlock_bh(&bat_priv->tt.req_list_lock);
-               kfree(tt_req_node);
        }
+
+       if (tt_req_node)
+               batadv_tt_req_node_put(tt_req_node);
+
        kfree(tvlv_tt_data);
        return ret;
 }
@@ -3057,7 +3088,7 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
                if (!batadv_compare_eth(node->addr, resp_src))
                        continue;
                hlist_del_init(&node->list);
-               kfree(node);
+               batadv_tt_req_node_put(node);
        }
 
        spin_unlock_bh(&bat_priv->tt.req_list_lock);

diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 6a577f4f8ba77ce1b2b923c55deada8a050802e8..ba846b078af82d9858a733e9253863edb5c6cb44 100644 (file)
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -1137,11 +1137,13 @@ struct batadv_tt_change_node {
  * struct batadv_tt_req_node - data to keep track of the tt requests in flight
  * @addr: mac address address of the originator this request was sent to
  * @issued_at: timestamp used for purging stale tt requests
+ * @refcount: number of contexts the object is used by
  * @list: list node for batadv_priv_tt::req_list
  */
 struct batadv_tt_req_node {
        u8 addr[ETH_ALEN];
        unsigned long issued_at;
+       struct kref refcount;
        struct hlist_node list;
 };