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

commit 9c4604a2 upstream.

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: a73105b8 ("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>
[bwh: Backported to 3.2:
 - Adjust context
 - Use struct tt_req_node instead of struct batadv_tt_req_node
 - Use list_empty() instead of hlist_unhashed()
 - Drop kernel-doc change]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

net/batman-adv/translation-table.c

@@ -952,6 +952,29 @@ uint16_t tt_local_crc(struct bat_priv *bat_priv)
 	return total;
 }
 
+/**
+ * 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 tt_req_node *tt_req_node;
+
+	tt_req_node = container_of(ref, struct 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 tt_req_node *tt_req_node)
+{
+	kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
+}
+
 static void tt_req_list_free(struct bat_priv *bat_priv)
 {
 	struct tt_req_node *node, *safe;
@@ -960,7 +983,7 @@ static void tt_req_list_free(struct bat_priv *bat_priv)
 
 	list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
 		list_del(&node->list);
-		kfree(node);
+		batadv_tt_req_node_put(node);
 	}
 
 	spin_unlock_bh(&bat_priv->tt_req_list_lock);
@@ -995,7 +1018,7 @@ static void tt_req_purge(struct bat_priv *bat_priv)
 		if (is_out_of_time(node->issued_at,
 		    TT_REQUEST_TIMEOUT * 1000)) {
 			list_del(&node->list);
-			kfree(node);
+			batadv_tt_req_node_put(node);
 		}
 	}
 	spin_unlock_bh(&bat_priv->tt_req_list_lock);
@@ -1020,9 +1043,11 @@ static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
 	if (!tt_req_node)
 		goto unlock;
 
+	kref_init(&tt_req_node->refcount);
 	memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
 	tt_req_node->issued_at = jiffies;
 
+	kref_get(&tt_req_node->refcount);
 	list_add(&tt_req_node->list, &bat_priv->tt_req_list);
 unlock:
 	spin_unlock_bh(&bat_priv->tt_req_list_lock);
@@ -1174,12 +1199,19 @@ static int send_tt_request(struct bat_priv *bat_priv,
 		hardif_free_ref(primary_if);
 	if (ret)
 		kfree_skb(skb);
+
 	if (ret && tt_req_node) {
 		spin_lock_bh(&bat_priv->tt_req_list_lock);
-		list_del(&tt_req_node->list);
+		if (!list_empty(&tt_req_node->list)) {
+			list_del(&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);
+
 	return ret;
 }
 
@@ -1552,7 +1584,7 @@ void handle_tt_response(struct bat_priv *bat_priv,
 		if (!compare_eth(node->addr, tt_response->src))
 			continue;
 		list_del(&node->list);
-		kfree(node);
+		batadv_tt_req_node_put(node);
 	}
 	spin_unlock_bh(&bat_priv->tt_req_list_lock);
 

net/batman-adv/types.h

@@ -250,6 +250,7 @@ struct tt_change_node {
 struct tt_req_node {
 	uint8_t addr[ETH_ALEN];
 	unsigned long issued_at;
+	struct kref refcount;
 	struct list_head list;
 };