linux-kernel - [PATCH] staging: rtl8712: Fix pointer dereferenced before checking

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Date:   Mon, 30 May 2022 16:05:32 +0800
From:   Haowen Bai <baihaowen@...zu.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Haowen Bai <baihaowen@...zu.com>, <linux-staging@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] staging: rtl8712: Fix pointer dereferenced before checking

The padapter->recvpriv.signal_qual_data is dereferencing before null
checking, so move it after checking.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
---
 drivers/staging/rtl8712/rtl8712_recv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/rtl8712_recv.c b/drivers/staging/rtl8712/rtl8712_recv.c
index 7f1fdd058551..8ed94b259dbe 100644
--- a/drivers/staging/rtl8712/rtl8712_recv.c
+++ b/drivers/staging/rtl8712/rtl8712_recv.c
@@ -863,10 +863,12 @@ static void process_link_qual(struct _adapter *padapter,
 {
 	u32	last_evm = 0, tmpVal;
 	struct rx_pkt_attrib *pattrib;
-	struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
+	struct smooth_rssi_data *sqd;
 
 	if (!prframe || !padapter)
 		return;
+
+	sqd = &padapter->recvpriv.signal_qual_data;
 	pattrib = &prframe->u.hdr.attrib;
 	if (pattrib->signal_qual != 0) {
 		/*
-- 
2.7.4