linux-kernel - [PATCH] [v2] Staging: rtl8188eu: rtw_mlme: Fix uninitialized variable authmode

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Message-Id: <20200728072153.9202-1-dinghao.liu@zju.edu.cn>
Date:   Tue, 28 Jul 2020 15:21:51 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu, dan.carpenter@...cle.com
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shreeya Patel <shreeya.patel23498@...il.com>,
        Michael Straube <straube.linux@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] Staging: rtl8188eu: rtw_mlme: Fix uninitialized variable authmode

The variable authmode can be uninitialized. The danger would be if
it equals to _WPA_IE_ID_ (0xdd) or _WPA2_IE_ID_ (0x33). We can avoid
this by setting it to zero instead. This is the approach that was
used in the rtl8723bs driver.

Fixes: 7b464c9fa5cc ("staging: r8188eu: Add files for new driver - part 4")
Co-developed-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: - Move the initialization after 'else' statement.
      Refine commit message.
---
 drivers/staging/rtl8188eu/core/rtw_mlme.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_mlme.c b/drivers/staging/rtl8188eu/core/rtw_mlme.c
index 9de2d421f6b1..4f2abe1e14d5 100644
--- a/drivers/staging/rtl8188eu/core/rtw_mlme.c
+++ b/drivers/staging/rtl8188eu/core/rtw_mlme.c
@@ -1729,9 +1729,11 @@ int rtw_restruct_sec_ie(struct adapter *adapter, u8 *in_ie, u8 *out_ie, uint in_
 	if ((ndisauthmode == Ndis802_11AuthModeWPA) ||
 	    (ndisauthmode == Ndis802_11AuthModeWPAPSK))
 		authmode = _WPA_IE_ID_;
-	if ((ndisauthmode == Ndis802_11AuthModeWPA2) ||
+	else if ((ndisauthmode == Ndis802_11AuthModeWPA2) ||
 	    (ndisauthmode == Ndis802_11AuthModeWPA2PSK))
 		authmode = _WPA2_IE_ID_;
+	else
+		authmode = 0x0;
 
 	if (check_fwstate(pmlmepriv, WIFI_UNDER_WPS)) {
 		memcpy(out_ie + ielength, psecuritypriv->wps_ie, psecuritypriv->wps_ie_len);
-- 
2.17.1