iwlwifi: clean key table in iwl_clear_stations_table function

commit 40a9a8299116297429298e8fcee08235134883f7 upstream.

This patch cleans uCode key table bit map iwl_clear_stations_table
since all stations are cleared also the key table must be.

Since the keys are not removed properly on suspend by mac80211
this may result in exhausting key table on resume leading
to memory corruption during removal

This patch also fixes a memory corruption problem reported in
http://marc.info/?l=linux-wireless&m=122641417231586&w=2 and tracked in
http://bugzilla.kernel.org/show_bug.cgi?id=12040.

When the key is removed a second time the offset is set to 255 - this
index is not valid for the ucode_key_table and corrupts the eeprom pointer
(which is 255 bits from ucode_key_table).

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Reported-by: Carlos R. Mafra <crmafra2@gmail.com>
Reported-by: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 1383fd14031173700ad584c017035b71c4b514b6..b346268273adfa36b52830bacd7e9c3040ac8322 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -290,6 +290,9 @@ void iwl_clear_stations_table(struct iwl_priv *priv)
        priv->num_stations = 0;
        memset(priv->stations, 0, sizeof(priv->stations));
 
+       /* clean ucode key table bit map */
+       priv->ucode_key_table = 0;
+
        spin_unlock_irqrestore(&priv->sta_lock, flags);
 }
 EXPORT_SYMBOL(iwl_clear_stations_table);

diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index 6283a3a707f58dad2f5cb17bfcb82ed05a57a148..f2d473cee83c9679fe71a005e7dc54eb3a2854bf 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -475,7 +475,7 @@ static int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
                if (!test_and_set_bit(i, &priv->ucode_key_table))
                        return i;
 
-       return -1;
+       return WEP_INVALID_OFFSET;
 }
 
 int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
@@ -620,6 +620,9 @@ static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
        /* else, we are overriding an existing key => no need to allocated room
         * in uCode. */
 
+       WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
+               "no space for new kew");
+
        priv->stations[sta_id].sta.key.key_flags = key_flags;
        priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
        priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
@@ -637,6 +640,7 @@ static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 {
        unsigned long flags;
        __le16 key_flags = 0;
+       int ret;
 
        key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
        key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
@@ -664,14 +668,18 @@ static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
        /* else, we are overriding an existing key => no need to allocated room
         * in uCode. */
 
+       WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
+               "no space for new kew");
+
        priv->stations[sta_id].sta.key.key_flags = key_flags;
        priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
        priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 
+       ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
+
        spin_unlock_irqrestore(&priv->sta_lock, flags);
 
-       IWL_DEBUG_INFO("hwcrypto: modify ucode station key info\n");
-       return iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
+       return ret;
 }
 
 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
@@ -696,6 +704,9 @@ static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
        /* else, we are overriding an existing key => no need to allocated room
         * in uCode. */
 
+       WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
+               "no space for new kew");
+
        /* This copy is acutally not needed: we get the key with each TX */
        memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 
@@ -734,6 +745,13 @@ int iwl_remove_dynamic_key(struct iwl_priv *priv,
                return 0;
        }
 
+       if (priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET) {
+               IWL_WARNING("Removing wrong key %d 0x%x\n",
+                           keyconf->keyidx, key_flags);
+               spin_unlock_irqrestore(&priv->sta_lock, flags);
+               return 0;
+       }
+
        if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
                &priv->ucode_key_table))
                IWL_ERROR("index %d not used in uCode key table.\n",