linux-kernel - [PATCH RFC 0/3] staging: r8188eu: avoid uninit value bugs

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Date:   Fri, 20 Aug 2021 20:07:28 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org, straube.linux@...il.com,
        fmdefrancesco@...il.com
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>
Subject: [PATCH RFC 0/3] staging: r8188eu: avoid uninit value bugs

Hi, Greg, Larry and Phillip!

I noticed, that new staging driver was added like 3 weeks ago and I decided
to look at the code, because drivers in staging directory are always buggy.

The first thing I noticed is *no one* was checking read operations result, but
it can fail and driver may start writing random stack values into registers. It
can cause driver misbehavior or device misbehavior.

To avoid this type of bugs, i've expanded read() API with error parametr,
which will be initialized to error if read fails. It helps callers to
break/return earlier and don't write random values to registers or to rely
on random values.

Why is this pacth series RFC?
  1. I don't have this device and I cannot test these changes.
  2. I don't know how to handle errors in each particular case. For now, function
     just returns or returns an error. That's all. I hope, driver maintainers will
     help with these bits.
  3. I guess, I handled not all uninit value bugs here. I hope, I fixed
     at least half of them

This series was build-tested and made on top of staging-testing branch


With regards,
Pavel Skripkin

Pavel Skripkin (3):
  staging: r8188eu: add proper rtw_read* error handling
  staging: r8188eu: add error handling to ReadFuse
  staging: r8188eu: add error argument to read_macreg

 drivers/staging/r8188eu/core/rtw_debug.c      |  79 +++-
 drivers/staging/r8188eu/core/rtw_efuse.c      | 119 +++--
 drivers/staging/r8188eu/core/rtw_io.c         |  18 +-
 drivers/staging/r8188eu/core/rtw_mp.c         |  38 +-
 drivers/staging/r8188eu/core/rtw_mp_ioctl.c   |  20 +-
 drivers/staging/r8188eu/core/rtw_pwrctrl.c    |   6 +-
 drivers/staging/r8188eu/core/rtw_sreset.c     |   7 +-
 drivers/staging/r8188eu/hal/HalPwrSeqCmd.c    |   9 +-
 drivers/staging/r8188eu/hal/hal_com.c         |  22 +-
 drivers/staging/r8188eu/hal/hal_intf.c        |   6 +-
 drivers/staging/r8188eu/hal/odm_interface.c   |  12 +-
 drivers/staging/r8188eu/hal/rtl8188e_cmd.c    |  37 +-
 drivers/staging/r8188eu/hal/rtl8188e_dm.c     |   6 +-
 .../staging/r8188eu/hal/rtl8188e_hal_init.c   | 260 ++++++++---
 drivers/staging/r8188eu/hal/rtl8188e_phycfg.c |  26 +-
 drivers/staging/r8188eu/hal/rtl8188e_sreset.c |  20 +-
 drivers/staging/r8188eu/hal/rtl8188eu_led.c   |  17 +-
 drivers/staging/r8188eu/hal/usb_halinit.c     | 412 ++++++++++++++----
 drivers/staging/r8188eu/hal/usb_ops_linux.c   |  55 ++-
 drivers/staging/r8188eu/include/hal_intf.h    |   6 +-
 .../staging/r8188eu/include/rtl8188e_hal.h    |   2 +-
 drivers/staging/r8188eu/include/rtw_efuse.h   |   4 +-
 drivers/staging/r8188eu/include/rtw_io.h      |  18 +-
 drivers/staging/r8188eu/include/rtw_mp.h      |   2 +-
 drivers/staging/r8188eu/os_dep/ioctl_linux.c  | 168 +++++--
 drivers/staging/r8188eu/os_dep/usb_intf.c     |   4 +-
 26 files changed, 1072 insertions(+), 301 deletions(-)

-- 
2.32.0