mwifiex: fix WPA connection problem

Device fails to connect to some AP's configured in WPA
security mode. Currently IE buffer parsing logic in driver
expects WPA IE to be present at the beginning of IE buffer.
Otherwise connection is failed with 'incompatible network
setting' error.

This patch fixes the problem by improving IE buffer parsing
logic.
Signed-off-by: chunfan chen <jeffc@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/sta_ioctl.c

@@ -1293,6 +1293,8 @@ mwifiex_set_gen_ie_helper(struct mwifiex_private *priv, u8 *ie_data_ptr,
 	struct ieee_types_vendor_header *pvendor_ie;
 	const u8 wpa_oui[] = { 0x00, 0x50, 0xf2, 0x01 };
 	const u8 wps_oui[] = { 0x00, 0x50, 0xf2, 0x04 };
+	u16 unparsed_len = ie_len;
+	int find_wpa_ie = 0;
 
 	/* If the passed length is zero, reset the buffer */
 	if (!ie_len) {
@@ -1304,40 +1306,69 @@ mwifiex_set_gen_ie_helper(struct mwifiex_private *priv, u8 *ie_data_ptr,
 		return -1;
 	}
 	pvendor_ie = (struct ieee_types_vendor_header *) ie_data_ptr;
-	/* Test to see if it is a WPA IE, if not, then it is a gen IE */
-	if (((pvendor_ie->element_id == WLAN_EID_VENDOR_SPECIFIC) &&
-	     (!memcmp(pvendor_ie->oui, wpa_oui, sizeof(wpa_oui)))) ||
-	    (pvendor_ie->element_id == WLAN_EID_RSN)) {
 
-		/* IE is a WPA/WPA2 IE so call set_wpa function */
-		ret = mwifiex_set_wpa_ie_helper(priv, ie_data_ptr, ie_len);
-		priv->wps.session_enable = false;
+	while (pvendor_ie) {
+		if (pvendor_ie->element_id == WLAN_EID_VENDOR_SPECIFIC) {
+			/* Test to see if it is a WPA IE, if not, then it is a
+			 * gen IE
+			 */
+			if (!memcmp(pvendor_ie->oui, wpa_oui,
+				    sizeof(wpa_oui))) {
+				find_wpa_ie = 1;
+				break;
+			}
 
-		return ret;
-	} else if (pvendor_ie->element_id == WLAN_EID_BSS_AC_ACCESS_DELAY) {
+			/* Test to see if it is a WPS IE, if so, enable
+			 * wps session flag
+			 */
+			if (!memcmp(pvendor_ie->oui, wps_oui,
+				    sizeof(wps_oui))) {
+				priv->wps.session_enable = true;
+				mwifiex_dbg(priv->adapter, MSG,
+					    "info: WPS Session Enabled.\n");
+				ret = mwifiex_set_wps_ie(priv,
+							 (u8 *)pvendor_ie,
+							 unparsed_len);
+			}
+		}
+
+		if (pvendor_ie->element_id == WLAN_EID_RSN) {
+			find_wpa_ie = 1;
+			break;
+		}
+
+		if (pvendor_ie->element_id == WLAN_EID_BSS_AC_ACCESS_DELAY) {
 		/* IE is a WAPI IE so call set_wapi function */
-		ret = mwifiex_set_wapi_ie(priv, ie_data_ptr, ie_len);
+			ret = mwifiex_set_wapi_ie(priv, (u8 *)pvendor_ie,
+						  unparsed_len);
+			return ret;
+		}
+
+		unparsed_len -= (pvendor_ie->len +
+				 sizeof(struct ieee_types_header));
+
+		if (unparsed_len <= sizeof(struct ieee_types_header))
+			pvendor_ie = NULL;
+		else
+			pvendor_ie = (struct ieee_types_vendor_header *)
+				(((u8 *)pvendor_ie) + pvendor_ie->len +
+				 sizeof(struct ieee_types_header));
+	}
 
+	if (find_wpa_ie) {
+		/* IE is a WPA/WPA2 IE so call set_wpa function */
+		ret = mwifiex_set_wpa_ie_helper(priv, (u8 *)pvendor_ie,
+						unparsed_len);
+		priv->wps.session_enable = false;
 		return ret;
 	}
+
 	/*
 	 * Verify that the passed length is not larger than the
 	 * available space remaining in the buffer
 	 */
 	if (ie_len < (sizeof(priv->gen_ie_buf) - priv->gen_ie_buf_len)) {
 
-		/* Test to see if it is a WPS IE, if so, enable
-		 * wps session flag
-		 */
-		pvendor_ie = (struct ieee_types_vendor_header *) ie_data_ptr;
-		if ((pvendor_ie->element_id == WLAN_EID_VENDOR_SPECIFIC) &&
-		    (!memcmp(pvendor_ie->oui, wps_oui, sizeof(wps_oui)))) {
-			priv->wps.session_enable = true;
-			mwifiex_dbg(priv->adapter, INFO,
-				    "info: WPS Session Enabled.\n");
-			ret = mwifiex_set_wps_ie(priv, ie_data_ptr, ie_len);
-		}
-
 		/* Append the passed data to the end of the
 		   genIeBuffer */
 		memcpy(priv->gen_ie_buf + priv->gen_ie_buf_len, ie_data_ptr,