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authorJouni Malinen <j@w1.fi>2010-07-26 15:52:03 -0700
committerJohn W. Linville <linville@tuxdriver.com>2010-07-27 14:59:58 -0400
commit32162a4dab0e6a4ca7f886a01173b5f9b80843be (patch)
treea8337e9b9788b787c13241ec9a9642527d5aad6a
parent1b2fb7dc71c1f8f97663c2da84fa1c8183588474 (diff)
downloadlinux-32162a4dab0e6a4ca7f886a01173b5f9b80843be.tar.bz2
mac80211: Fix key freeing to handle unlinked keys
Key locking simplification removed key->sdata != NULL verification from ieee80211_key_free(). While that is fine for most use cases, there is one path where this function can be called with an unlinked key (i.e., key->sdata == NULL && key->local == NULL). This results in a NULL pointer dereference with the current implementation. This is known to happen at least with FT protocol when wpa_supplicant tries to configure the key before association. Avoid the issue by passing in the local pointer to ieee80211_key_free(). In addition, do not clear the key from hw_accel or debugfs if it has not yet been added. At least the hw_accel one could trigger another NULL pointer dereference. Signed-off-by: Jouni Malinen <j@w1.fi> Reviewed-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--net/mac80211/cfg.c6
-rw-r--r--net/mac80211/key.c13
-rw-r--r--net/mac80211/key.h3
-rw-r--r--net/mac80211/sta_info.c2
4 files changed, 12 insertions, 12 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b769567949be..dab6b8efe5fa 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -158,7 +158,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
if (mac_addr) {
sta = sta_info_get_bss(sdata, mac_addr);
if (!sta) {
- ieee80211_key_free(key);
+ ieee80211_key_free(sdata->local, key);
err = -ENOENT;
goto out_unlock;
}
@@ -192,7 +192,7 @@ static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
goto out_unlock;
if (sta->key) {
- ieee80211_key_free(sta->key);
+ ieee80211_key_free(sdata->local, sta->key);
WARN_ON(sta->key);
ret = 0;
}
@@ -205,7 +205,7 @@ static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
goto out_unlock;
}
- ieee80211_key_free(sdata->keys[key_idx]);
+ ieee80211_key_free(sdata->local, sdata->keys[key_idx]);
WARN_ON(sdata->keys[key_idx]);
ret = 0;
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 50d1cff23d8e..1b9d87ed143a 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -323,13 +323,15 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
if (!key)
return;
- ieee80211_key_disable_hw_accel(key);
+ if (key->local)
+ ieee80211_key_disable_hw_accel(key);
if (key->conf.alg == ALG_CCMP)
ieee80211_aes_key_free(key->u.ccmp.tfm);
if (key->conf.alg == ALG_AES_CMAC)
ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
- ieee80211_debugfs_key_remove(key);
+ if (key->local)
+ ieee80211_debugfs_key_remove(key);
kfree(key);
}
@@ -410,15 +412,12 @@ static void __ieee80211_key_free(struct ieee80211_key *key)
__ieee80211_key_destroy(key);
}
-void ieee80211_key_free(struct ieee80211_key *key)
+void ieee80211_key_free(struct ieee80211_local *local,
+ struct ieee80211_key *key)
{
- struct ieee80211_local *local;
-
if (!key)
return;
- local = key->sdata->local;
-
mutex_lock(&local->key_mtx);
__ieee80211_key_free(key);
mutex_unlock(&local->key_mtx);
diff --git a/net/mac80211/key.h b/net/mac80211/key.h
index a3849fa3fce8..b665bbb7a471 100644
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -135,7 +135,8 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
void ieee80211_key_link(struct ieee80211_key *key,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta);
-void ieee80211_key_free(struct ieee80211_key *key);
+void ieee80211_key_free(struct ieee80211_local *local,
+ struct ieee80211_key *key);
void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
int idx);
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 67656cbf2b15..6d86f0c1ad04 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -647,7 +647,7 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
return ret;
if (sta->key) {
- ieee80211_key_free(sta->key);
+ ieee80211_key_free(local, sta->key);
WARN_ON(sta->key);
}