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From:   Vihas Makwana <makvihas@gmail.com>
To:     Larry Finger <Larry.Finger@lwfinger.net>,
        Phillip Potter <phil@philpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Michael Straube <straube.linux@gmail.com>
Cc:     linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Pavel Skripkin <paskripkin@gmail.com>,
        Vihas Makwana <makvihas@gmail.com>
Subject: [PATCH] staging: r8188eu: fix a potential NULL pointer dereference
Date:   Sun, 24 Apr 2022 00:17:48 +0530
Message-Id: <20220423184745.21134-1-makvihas@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

recvframe_chk_defrag() performs a NULL check on psta, but if that check
fails then it dereferences it, which it shouldn't do as psta is NULL.

Set pdefrag_q to NULL if above check fails and let the code after it handle
that case.

Fixes: 1cc18a22b96b ("staging: r8188eu: Add files for new driver - part 5")
Signed-off-by: Vihas Makwana <makvihas@gmail.com>
---
 drivers/staging/r8188eu/core/rtw_recv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/core/rtw_recv.c b/drivers/staging/r8188eu/core/rtw_recv.c
index c1005ddaa..db54bceff 100644
--- a/drivers/staging/r8188eu/core/rtw_recv.c
+++ b/drivers/staging/r8188eu/core/rtw_recv.c
@@ -1244,7 +1244,7 @@ struct recv_frame *recvframe_chk_defrag(struct adapter *padapter, struct recv_fr
 			pdefrag_q = NULL;
 		}
 	} else {
-		pdefrag_q = &psta->sta_recvpriv.defrag_q;
+		pdefrag_q = NULL;
 	}
 
 	if ((ismfrag == 0) && (fragnum == 0))
-- 
2.30.2