iwlwifi: check scan request ie_len

In mac80211 we always check both scan_req->ie and scan_req->ie_len
against zero before usage, in iwlwifi we should do the same.

Remove not needed "left -= ie_len" while at it.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index d817c9c184a5..83e62917e0bf 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -644,10 +644,10 @@ u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
         if (WARN_ON(left < ie_len))
                 return len;
 
-        if (ies)
+        if (ies && ie_len) {
                 memcpy(pos, ies, ie_len);
-        len += ie_len;
-        left -= ie_len;
+                len += ie_len;
+        }
 
         return (u16)len;
 }