linux-hardening - [PATCH 3/3 v2] staging: rtl8712: Drop get_recvframe

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Message-Id: <20220115042427.824542-4-keescook@chromium.org>
Date:   Fri, 14 Jan 2022 20:24:27 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zhansaya Bagdauletkyzy <zhansayabagdaulet@...il.com>,
        Ivan Safonov <insafonov@...il.com>,
        linux-staging@...ts.linux.dev,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        Martin Kaiser <martin@...ser.cx>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Marco Cesati <marcocesati@...il.com>,
        Joe Perches <joe@...ches.com>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH 3/3 v2] staging: rtl8712: Drop get_recvframe_data()

As done for rtl8723bs and r8188eu, drop get_recvframe_data(), as it
introduces an impossible value (NULL) for the compiler to check code
paths against which could result in nonsensical warnings.

Cc: Larry Finger <Larry.Finger@...inger.net>
Cc: Florian Schilhabel <florian.c.schilhabel@...glemail.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Zhansaya Bagdauletkyzy <zhansayabagdaulet@...il.com>
Cc: Ivan Safonov <insafonov@...il.com>
Cc: linux-staging@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/staging/rtl8712/rtl871x_recv.c | 4 ++--
 drivers/staging/rtl8712/rtl871x_recv.h | 8 --------
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/rtl8712/rtl871x_recv.c b/drivers/staging/rtl8712/rtl871x_recv.c
index c23f6b376111..a069e4d98eef 100644
--- a/drivers/staging/rtl8712/rtl871x_recv.c
+++ b/drivers/staging/rtl8712/rtl871x_recv.c
@@ -234,7 +234,7 @@ union recv_frame *r8712_portctrl(struct _adapter *adapter,
 	u16 ether_type;
 
 	pstapriv = &adapter->stapriv;
-	ptr = get_recvframe_data(precv_frame);
+	ptr = precvframe->u.hdr.rx_data;
 	pfhdr = &precv_frame->u.hdr;
 	psta_addr = pfhdr->attrib.ta;
 	psta = r8712_get_stainfo(pstapriv, psta_addr);
@@ -593,7 +593,7 @@ int r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
 	struct _adapter	*adapter = precvframe->u.hdr.adapter;
 	struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
 
-	u8 *ptr = get_recvframe_data(precvframe); /*point to frame_ctrl field*/
+	u8 *ptr = precvframe->u.hdr.rx_data; /*point to frame_ctrl field*/
 	struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib;
 
 	if (pattrib->encrypt)
diff --git a/drivers/staging/rtl8712/rtl871x_recv.h b/drivers/staging/rtl8712/rtl871x_recv.h
index 1c8298bde033..0760bccbf389 100644
--- a/drivers/staging/rtl8712/rtl871x_recv.h
+++ b/drivers/staging/rtl8712/rtl871x_recv.h
@@ -139,14 +139,6 @@ static inline u8 *get_rxmem(union recv_frame *precvframe)
 	return precvframe->u.hdr.rx_head;
 }
 
-static inline u8 *get_recvframe_data(union recv_frame *precvframe)
-{
-	/* always return rx_data */
-	if (!precvframe)
-		return NULL;
-	return precvframe->u.hdr.rx_data;
-}
-
 static inline u8 *recvframe_pull(union recv_frame *precvframe, sint sz)
 {
 	/* used for extract sz bytes from rx_data, update rx_data and return
-- 
2.30.2