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

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SVN-Revision: 14202
This commit is contained in:
Felix Fietkau 2009-01-26 14:36:39 +00:00
parent ff21a7a7fa
commit 172dbe47b6
1 changed files with 15 additions and 13 deletions
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28
package/madwifi/patches/370-wdsvap.patch
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@ -903,7 +903,7 @@
} }
/* This is overridden by ath_node_alloc in ath/if_ath.c, and so /* 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; return ni;
} }
@ -957,6 +957,9 @@
+ if (ni->ni_subif) + if (ni->ni_subif)
+ return; + return;
+ +
+ if (!ni->ni_table)
+ return;
+
+ ieee80211_ref_node(ni); + ieee80211_ref_node(ni);
+ ni->ni_subif = ni->ni_vap; + ni->ni_subif = ni->ni_vap;
+ IEEE80211_INIT_WORK(&ni->ni_create, ieee80211_wds_do_addif); + IEEE80211_INIT_WORK(&ni->ni_create, ieee80211_wds_do_addif);
@ -966,7 +969,7 @@
/* Add wds address to the node table */ /* Add wds address to the node table */
int int
#ifdef IEEE80211_DEBUG_REFCNT #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) ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
struct ieee80211_node_table *nt; struct ieee80211_node_table *nt;
struct ieee80211_node *ni; struct ieee80211_node *ni;
@ -1015,7 +1018,7 @@
#endif #endif
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt); 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) ieee80211_find_txnode(struct ieee80211vap *vap, const u_int8_t *mac)
#endif #endif
{ {
@ -1035,7 +1038,7 @@
/* /*
* The destination address should be in the node table * The destination address should be in the node table
* unless we are operating in station mode or this is a * 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; struct ieee80211vap *vap = ni->ni_vap;
@ -1047,7 +1050,7 @@
atomic_dec(&ni->ni_ic->ic_node_counter); atomic_dec(&ni->ni_ic->ic_node_counter);
node_print_message(IEEE80211_MSG_NODE|IEEE80211_MSG_NODE_REF, node_print_message(IEEE80211_MSG_NODE|IEEE80211_MSG_NODE_REF,
1 /* show counter */, 1 /* show counter */,
@@ -1781,22 +1880,6 @@ restart: @@ -1781,22 +1883,6 @@ restart:
jiffies > ni->ni_rxfragstamp + HZ) { jiffies > ni->ni_rxfragstamp + HZ) {
ieee80211_dev_kfree_skb(&ni->ni_rxfrag); ieee80211_dev_kfree_skb(&ni->ni_rxfrag);
} }
@ -1070,7 +1073,7 @@
ni->ni_inact--; ni->ni_inact--;
if (ni->ni_associd != 0 || isadhoc) { if (ni->ni_associd != 0 || isadhoc) {
struct ieee80211vap *vap = ni->ni_vap; 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 ieee80211vap *vap;
+ struct ieee80211com *ic; + 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(); + rtnl_lock();
+ vap = ni->ni_subif; + 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) + if (!vap)
+ goto done; + goto done;
+ +
@ -1107,7 +1109,7 @@
/* /*
* Handle bookkeeping for a station/neighbor leaving * Handle bookkeeping for a station/neighbor leaving
* the bss when operating in ap or adhoc modes. * 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)", ni, "station with aid %d leaves (refcnt %u)",
IEEE80211_NODE_AID(ni), atomic_read(&ni->ni_refcnt)); IEEE80211_NODE_AID(ni), atomic_read(&ni->ni_refcnt));