linux-kernel - [PATCH 4.9 018/109] staging: rtl8188eu: avoid a null dereference on pmlmepriv

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Message-Id: <20171207125636.802406257@linuxfoundation.org>
Date:   Thu,  7 Dec 2017 13:56:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 018/109] staging: rtl8188eu: avoid a null dereference on pmlmepriv

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>


[ Upstream commit 123c0aab0050cd0e07ce18e453389fbbb0a5a425 ]

There is a check on pmlmepriv before dereferencing it when
vfree'ing pmlmepriv->free_bss_buf however the previous call
to rtw_free_mlme_priv_ie_data deferences pmlmepriv causing
a null pointer deference if it is null.  Avoid this by also
calling rtw_free_mlme_priv_ie_data if the pointer is non-null.

Detected by CoverityScan, CID#1230262 ("Dereference before null check")
Fixes: 7b464c9fa5cc ("staging: r8188eu: Add files for new driver - part 4")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/rtl8188eu/core/rtw_mlme.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/staging/rtl8188eu/core/rtw_mlme.c
+++ b/drivers/staging/rtl8188eu/core/rtw_mlme.c
@@ -107,10 +107,10 @@ void rtw_free_mlme_priv_ie_data(struct m
 
 void rtw_free_mlme_priv(struct mlme_priv *pmlmepriv)
 {
-	rtw_free_mlme_priv_ie_data(pmlmepriv);
-
-	if (pmlmepriv)
+	if (pmlmepriv) {
+		rtw_free_mlme_priv_ie_data(pmlmepriv);
 		vfree(pmlmepriv->free_bss_buf);
+	}
 }
 
 struct wlan_network *_rtw_alloc_network(struct mlme_priv *pmlmepriv)