linux-hardening - [PATCH 0/3 v2] staging: rtl*: Check for NULL header value

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Date:   Fri, 14 Jan 2022 20:24:24 -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>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zhansaya Bagdauletkyzy <zhansayabagdaulet@...il.com>,
        Ivan Safonov <insafonov@...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-staging@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: [PATCH 0/3 v2] staging: rtl*: Check for NULL header value

Hi,

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 due to various paths to the memcpy() where the compile could
see the destination buffer having a NULL value. This series fixes this
by both eliminating cases where NULL returns were impossible and adding
missing NULL checks where values were possible.

Thanks!

-Kees

v1: https://lore.kernel.org/lkml/20220113002001.3498383-1-keescook@chromium.org/
v2:
 - drop get_recvframe_data()
 - add missing NULL checks to r8188eu and rtl8723bs (already present in rtl8712)

Kees Cook (3):
  staging: r8188eu: Drop get_recvframe_data()
  staging: rtl8723bs: Drop get_recvframe_data()
  staging: rtl8712: Drop get_recvframe_data()

 drivers/staging/r8188eu/core/rtw_recv.c        |  6 +++++-
 drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c  |  4 +---
 drivers/staging/r8188eu/include/rtw_recv.h     |  9 ---------
 drivers/staging/rtl8712/rtl871x_recv.c         |  4 ++--
 drivers/staging/rtl8712/rtl871x_recv.h         |  8 --------
 drivers/staging/rtl8723bs/core/rtw_recv.c      | 11 ++++++++---
 drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c |  3 +--
 drivers/staging/rtl8723bs/include/rtw_recv.h   | 11 -----------
 8 files changed, 17 insertions(+), 39 deletions(-)

-- 
2.30.2