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authorFelix Fietkau <nbd@openwrt.org>2008-11-02 13:05:46 +0000
committerFelix Fietkau <nbd@openwrt.org>2008-11-02 13:05:46 +0000
commitf44a4a0b00aa25039a8ae7e6a02658429d8c5c30 (patch)
tree6a66acc201597d9816dd784cc20beaf5b802238f
parentdec207d4eb4927112242da74afd1179d137fb1ad (diff)
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madwifi: fix ACL race condition (patch by Sebastian Gottschall)
SVN-Revision: 13097
-rw-r--r--package/madwifi/patches/386-acl_crashfix.patch116
1 files changed, 116 insertions, 0 deletions
diff --git a/package/madwifi/patches/386-acl_crashfix.patch b/package/madwifi/patches/386-acl_crashfix.patch
new file mode 100644
index 0000000..12f3273
--- /dev/null
+++ b/package/madwifi/patches/386-acl_crashfix.patch
@@ -0,0 +1,116 @@
+fixes ACL race condition caused by acl list modifications at run time
+
+Signed-off-by: Sebastian Gottschall <brainslayer@dd-wrt.com>
+
+--- a/net80211/ieee80211_acl.c
++++ b/net80211/ieee80211_acl.c
+@@ -112,9 +112,9 @@ acl_detach(struct ieee80211vap *vap)
+ {
+ struct aclstate *as = vap->iv_as;
+
+- ACL_LOCK(as);
++ ACL_LOCK_IRQ(as);
+ acl_free_all_locked(as);
+- ACL_UNLOCK(as);
++ ACL_UNLOCK_IRQ(as);
+ vap->iv_as = NULL;
+ ACL_LOCK_DESTROY(as);
+ FREE(as, M_DEVBUF);
+@@ -128,11 +128,18 @@ _find_acl(struct aclstate *as, const u_i
+ struct acl *acl;
+ int hash;
+
++ /* locking needed, as inserts are not atomic */
++ ACL_LOCK_IRQ(as);
+ hash = ACL_HASH(macaddr);
+ LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
+- if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
+- return acl;
++ if (!IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
++ continue;
++
++ ACL_UNLOCK_IRQ_EARLY(as);
++ return acl;
+ }
++ ACL_UNLOCK_IRQ(as);
++
+ return NULL;
+ }
+
+@@ -176,11 +183,11 @@ acl_add(struct ieee80211vap *vap, const
+ return -ENOMEM;
+ }
+
+- ACL_LOCK(as);
++ ACL_LOCK_IRQ(as);
+ hash = ACL_HASH(mac);
+ LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
+ if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) {
+- ACL_UNLOCK_EARLY(as);
++ ACL_UNLOCK_IRQ_EARLY(as);
+ FREE(new, M_80211_ACL);
+ IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
+ "ACL: add " MAC_FMT " failed, already present\n",
+@@ -191,7 +198,7 @@ acl_add(struct ieee80211vap *vap, const
+ IEEE80211_ADDR_COPY(new->acl_macaddr, mac);
+ TAILQ_INSERT_TAIL(&as->as_list, new, acl_list);
+ LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash);
+- ACL_UNLOCK(as);
++ ACL_UNLOCK_IRQ(as);
+
+ IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
+ "ACL: add " MAC_FMT "\n", MAC_ADDR(mac));
+@@ -204,11 +211,11 @@ acl_remove(struct ieee80211vap *vap, con
+ struct aclstate *as = vap->iv_as;
+ struct acl *acl;
+
+- ACL_LOCK(as);
++ ACL_LOCK_IRQ(as);
+ acl = _find_acl(as, mac);
+ if (acl != NULL)
+ _acl_free(as, acl);
+- ACL_UNLOCK(as);
++ ACL_UNLOCK_IRQ(as);
+
+ IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
+ "ACL: remove " MAC_FMT "%s\n", MAC_ADDR(mac),
+@@ -235,9 +242,9 @@ acl_free_all(struct ieee80211vap *vap)
+
+ IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all");
+
+- ACL_LOCK(as);
++ ACL_LOCK_IRQ(as);
+ acl_free_all_locked(vap->iv_as);
+- ACL_UNLOCK(as);
++ ACL_UNLOCK_IRQ(as);
+
+ return 0;
+ }
+--- a/net80211/ieee80211_linux.h
++++ b/net80211/ieee80211_linux.h
+@@ -311,16 +311,15 @@ typedef spinlock_t ieee80211_scan_lock_t
+ typedef spinlock_t acl_lock_t;
+ #define ACL_LOCK_INIT(_as, _name) spin_lock_init(&(_as)->as_lock)
+ #define ACL_LOCK_DESTROY(_as)
+-#define ACL_LOCK(_as) do { \
+- ACL_LOCK_CHECK(_as); \
+- spin_lock(&(_as)->as_lock);
+-#define ACL_UNLOCK(_as) \
+- ACL_LOCK_ASSERT(_as); \
+- spin_unlock(&(_as)->as_lock); \
+-} while(0)
+-#define ACL_UNLOCK_EARLY(_as) \
+- ACL_LOCK_ASSERT(_as); \
+- spin_unlock(&(_as)->as_lock);
++#define ACL_LOCK_IRQ(_as) do { \
++ unsigned long __acl_lockflags; \
++ spin_lock_irqsave(&(_as)->as_lock, __acl_lockflags);
++#define ACL_UNLOCK_IRQ(_as) \
++ spin_unlock_irqrestore(&(_as)->as_lock, __acl_lockflags); \
++} while (0)
++#define ACL_UNLOCK_IRQ_EARLY(_as) do { \
++ spin_unlock_irqrestore(&(_as)->as_lock, __acl_lockflags); \
++} while (0)
+
+ #if (defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)) && defined(spin_is_locked)
+ #define ACL_LOCK_ASSERT(_as) \