staging: rtl8723bs: Drop get_recvframe_data()

When building with -Warray-bounds, the following warning is emitted:

In file included from ./include/linux/string.h:253,
                 from ./arch/x86/include/asm/page_32.h:22,
                 from ./arch/x86/include/asm/page.h:14,
                 from ./arch/x86/include/asm/thread_info.h:12,
                 from ./include/linux/thread_info.h:60,
                 from ./arch/x86/include/asm/preempt.h:7,
                 from ./include/linux/preempt.h:78,
                 from ./include/linux/rcupdate.h:27,
                 from ./include/linux/rculist.h:11,
                 from ./include/linux/sched/signal.h:5,
                 from ./drivers/staging/rtl8723bs/include/drv_types.h:17,
                 from drivers/staging/rtl8723bs/core/rtw_recv.c:7:
In function 'memcpy',
    inlined from 'wlanhdr_to_ethhdr' at drivers/staging/rtl8723bs/core/rtw_recv.c:1554:2:
./include/linux/fortify-string.h:41:33: warning: '__builtin_memcpy' offset [0, 5] is out of the bounds [0, 0] [-Warray-bounds]
   41 | #define __underlying_memcpy     __builtin_memcpy
      |                                 ^

This is because the compiler sees it is possible for "ptr" to be a NULL
value, and concludes that it has zero size and attempts to copy to it
would overflow. Instead, remove the get_recvframe_data() entirely, as
it's not possible for this to ever be NULL.

Additionally add missing NULL checks after recvframe_pull() (which are
present in the rtl8712 driver).

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Michael Straube <straube.linux@gmail.com>
Cc: Fabio Aiuto <fabioaiuto83@gmail.com>
Cc: linux-staging@lists.linux.dev
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220118193327.2822099-3-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8723bs/core/rtw_recv.c b/drivers/staging/rtl8723bs/core/rtw_recv.c
index 41bfca5..36a50bc 100644 (file)
--- a/drivers/staging/rtl8723bs/core/rtw_recv.c
+++ b/drivers/staging/rtl8723bs/core/rtw_recv.c
@@ -465,7 +465,7 @@ static union recv_frame *portctrl(struct adapter *adapter, union recv_frame *pre
 
        auth_alg = adapter->securitypriv.dot11AuthAlgrthm;
 
-       ptr = get_recvframe_data(precv_frame);
+       ptr = precv_frame->u.hdr.rx_data;
        pfhdr = &precv_frame->u.hdr;
        pattrib = &pfhdr->attrib;
        psta_addr = pattrib->ta;
@@ -1510,7 +1510,7 @@ static signed int wlanhdr_to_ethhdr(union recv_frame *precvframe)
        __be16 be_tmp;
        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)
@@ -1546,10 +1546,15 @@ static signed int wlanhdr_to_ethhdr(union recv_frame *precvframe)
                eth_type = 0x8712;
                /*  append rx status for mp test packets */
                ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr)+2)-24);
+               if (!ptr)
+                       return _FAIL;
                memcpy(ptr, get_rxmem(precvframe), 24);
                ptr += 24;
-       } else
+       } else {
                ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr) + (bsnaphdr?2:0)));
+               if (!ptr)
+                       return _FAIL;
+       }
 
        memcpy(ptr, pattrib->dst, ETH_ALEN);
        memcpy(ptr+ETH_ALEN, pattrib->src, ETH_ALEN);

diff --git a/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c b/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c
index c0a1a6f..74e75dc 100644 (file)
--- a/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c
+++ b/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c
@@ -81,7 +81,7 @@ static void update_recvframe_phyinfo(union recv_frame *precvframe,
        struct odm_phy_info *p_phy_info =
                (struct odm_phy_info *)(&pattrib->phy_info);
 
-       u8 *wlanhdr;
+       u8 *wlanhdr = precvframe->u.hdr.rx_data;
        u8 *my_bssid;
        u8 *rx_bssid;
        u8 *rx_ra;
@@ -100,7 +100,6 @@ static void update_recvframe_phyinfo(union recv_frame *precvframe,
        struct sta_priv *pstapriv;
        struct sta_info *psta;
 
-       wlanhdr = get_recvframe_data(precvframe);
        my_bssid = get_bssid(&padapter->mlmepriv);
        rx_bssid = get_hdr_bssid(wlanhdr);
        pkt_info.bssid_match = ((!IsFrameTypeCtrl(wlanhdr)) &&

diff --git a/drivers/staging/rtl8723bs/include/rtw_recv.h b/drivers/staging/rtl8723bs/include/rtw_recv.h
index a88b7c0..44f6710 100644 (file)
--- a/drivers/staging/rtl8723bs/include/rtw_recv.h
+++ b/drivers/staging/rtl8723bs/include/rtw_recv.h
@@ -385,17 +385,6 @@ 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)
-{
-
-       /* alwasy return rx_data */
-       if (precvframe == NULL)
-               return NULL;
-
-       return precvframe->u.hdr.rx_data;
-
-}
-
 static inline u8 *recvframe_pull(union recv_frame *precvframe, signed int sz)
 {
        /*  rx_data += sz; move rx_data sz bytes  hereafter */