iwlegacy: don't mess up the SCD when removing a key

commit b48d9665 upstream.

When we remove a key, we put a key index which was supposed
to tell the fw that we are actually removing the key. But
instead the fw took that index as a valid index and messed
up the SRAM of the device.

This memory corruption on the device mangled the data of
the SCD. The impact on the user is that SCD queue 2 got
stuck after having removed keys.
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
[bwh: Backported to 3.2: adjust filename, context and variable name]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/net/wireless/iwlegacy/iwl-4965-sta.c

@@ -466,7 +466,7 @@ int iwl4965_remove_dynamic_key(struct iwl_priv *priv,
 		return 0;
 	}
 
-	if (priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET) {
+	if (priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_INVALID) {
 		IWL_WARN(priv, "Removing wrong key %d 0x%x\n",
 			    keyconf->keyidx, key_flags);
 		spin_unlock_irqrestore(&priv->sta_lock, flags);
@@ -483,7 +483,7 @@ int iwl4965_remove_dynamic_key(struct iwl_priv *priv,
 					sizeof(struct iwl4965_keyinfo));
 	priv->stations[sta_id].sta.key.key_flags =
 			STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
-	priv->stations[sta_id].sta.key.key_offset = WEP_INVALID_OFFSET;
+	priv->stations[sta_id].sta.key.key_offset = keyconf->hw_key_idx;
 	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;