madwifi: fix a potential race condition in the wds ap station interface setup/teardown

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14202 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/madwifi/patches/370-wdsvap.patch b/package/madwifi/patches/370-wdsvap.patch
index d1f255d..f72e22f 100644 (file)
--- a/package/madwifi/patches/370-wdsvap.patch
+++ b/package/madwifi/patches/370-wdsvap.patch
@@ -903,7 +903,7 @@
  }
  
  /* This is overridden by ath_node_alloc in ath/if_ath.c, and so
-@@ -1134,6 +1145,62 @@ ieee80211_alloc_node(struct ieee80211vap
+@@ -1134,6 +1145,65 @@ ieee80211_alloc_node(struct ieee80211vap
        return ni;
  }
  
@@ -957,6 +957,9 @@
 +      if (ni->ni_subif)
 +              return;
 +
++      if (!ni->ni_table)
++              return;
++
 +      ieee80211_ref_node(ni);
 +      ni->ni_subif = ni->ni_vap;
 +      IEEE80211_INIT_WORK(&ni->ni_create, ieee80211_wds_do_addif);
@@ -966,7 +969,7 @@
  /* Add wds address to the node table */
  int
  #ifdef IEEE80211_DEBUG_REFCNT
-@@ -1553,22 +1620,39 @@ ieee80211_find_rxnode(struct ieee80211co
+@@ -1553,22 +1623,39 @@ ieee80211_find_rxnode(struct ieee80211co
        ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
        struct ieee80211_node_table *nt;
        struct ieee80211_node *ni;
@@ -1015,7 +1018,7 @@
  #endif
        IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
  
-@@ -1596,9 +1680,19 @@ ieee80211_find_txnode_debug(struct ieee8
+@@ -1596,9 +1683,19 @@ ieee80211_find_txnode_debug(struct ieee8
  ieee80211_find_txnode(struct ieee80211vap *vap, const u_int8_t *mac)
  #endif
  {
@@ -1035,7 +1038,7 @@
        /*
         * The destination address should be in the node table
         * unless we are operating in station mode or this is a
-@@ -1669,6 +1763,11 @@ ieee80211_free_node(struct ieee80211_nod
+@@ -1669,6 +1766,11 @@ ieee80211_free_node(struct ieee80211_nod
  {
        struct ieee80211vap *vap = ni->ni_vap;
  
@@ -1047,7 +1050,7 @@
        atomic_dec(&ni->ni_ic->ic_node_counter);
        node_print_message(IEEE80211_MSG_NODE|IEEE80211_MSG_NODE_REF,
                           1 /* show counter */, 
-@@ -1781,22 +1880,6 @@ restart:
+@@ -1781,22 +1883,6 @@ restart:
                    jiffies > ni->ni_rxfragstamp + HZ) {
                        ieee80211_dev_kfree_skb(&ni->ni_rxfrag);
                }
@@ -1070,7 +1073,7 @@
                ni->ni_inact--;
                if (ni->ni_associd != 0 || isadhoc) {
                        struct ieee80211vap *vap = ni->ni_vap;
-@@ -2263,6 +2346,36 @@ ieee80211_node_leave_11g(struct ieee8021
+@@ -2263,6 +2349,35 @@ ieee80211_node_leave_11g(struct ieee8021
        }
  }
  
@@ -1081,15 +1084,14 @@
 +      struct ieee80211vap *vap;
 +      struct ieee80211com *ic;
 +
++      /* wait for full initialization before we start the teardown
++       * otherwise we could leak interfaces */
++      while (ni->ni_subif == ni->ni_vap)
++              schedule();
++
 +      rtnl_lock();
 +      vap = ni->ni_subif;
 +
-+      /* if addif is waiting for the timer to fire, cancel! */
-+      if (vap == ni->ni_vap) {
-+              ni->ni_subif = NULL;
-+              goto done;
-+      }
-+
 +      if (!vap)
 +              goto done;
 +
@@ -1107,7 +1109,7 @@
  /*
   * Handle bookkeeping for a station/neighbor leaving
   * the bss when operating in ap or adhoc modes.
-@@ -2279,6 +2392,12 @@ ieee80211_node_leave(struct ieee80211_no
+@@ -2279,6 +2394,12 @@ ieee80211_node_leave(struct ieee80211_no
                        ni, "station with aid %d leaves (refcnt %u)",
                        IEEE80211_NODE_AID(ni), atomic_read(&ni->ni_refcnt));