linux-kernel - [PATCH 3/3] staging: r8188eu: fix null check in _rtw_free_mlme

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Message-Id: <20220424163132.37007-4-makvihas@gmail.com>
Date:   Sun, 24 Apr 2022 22:01:32 +0530
From:   Vihas Makwana <makvihas@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        Vihas Makwana <makvihas@...il.com>
Subject: [PATCH 3/3] staging: r8188eu: fix null check in _rtw_free_mlme_priv

There's a NULL check on pmlmepriv in rtw_mlme.c:112 which makes no sense
as rtw_free_mlme_priv_ie_data() dereferences it unconditionally and it
would have already crashed at this point. 
Fix this by moving rtw_free_mlme_priv_ie_data() inside the check.

Signed-off-by: Vihas Makwana <makvihas@...il.com>
---
 drivers/staging/r8188eu/core/rtw_mlme.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_mlme.c b/drivers/staging/r8188eu/core/rtw_mlme.c
index 081c02417..87c754462 100644
--- a/drivers/staging/r8188eu/core/rtw_mlme.c
+++ b/drivers/staging/r8188eu/core/rtw_mlme.c
@@ -109,12 +109,10 @@ void rtw_free_mlme_priv_ie_data(struct mlme_priv *pmlmepriv)
 
 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)/* _queue *free_queue) */
-- 
2.30.2