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From: Pavel Skripkin <paskripkin@gmail.com>
To: Phillip Potter <phil@philpotter.co.uk>
Cc: linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
	Larry.Finger@lwfinger.net, gregkh@linuxfoundation.org,
	straube.linux@gmail.com, fmdefrancesco@gmail.com
Subject: Re: [PATCH RFC 0/3] staging: r8188eu: avoid uninit value bugs
Date: Sat, 21 Aug 2021 13:42:30 +0300	[thread overview]
Message-ID: <8d16252d-d85d-284b-0235-f41d5d2166cf@gmail.com> (raw)
In-Reply-To: <df71ec12574f546edc0620dc5624c09e921a8f23.camel@philpotter.co.uk>

On 8/21/21 2:12 AM, Phillip Potter wrote:
> On Fri, 2021-08-20 at 20:07 +0300, Pavel Skripkin wrote:
>> 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(-)
>> 
> 
> Dear Pavel,
> 
> Firstly, thank you for this contribution, it is much appreciated.
> Whilst I'm still learning myself when it comes to this driver and to
> kernel code in general, I can certainly say the code looks pretty good
> in general so far. I will try and offer individual comments on each
> patch.
> 

Thank you for your feedback. So, I will prepare a v2 version in few days 
and, I think, I will leave RFC prefix.

Also, I want to receive some feedback from Larry about error handling in 
each particular case, I guess, he can help us with it.

So, I will split each rtw_read* changes into separate patche and make 
them return an error instead of read value.


Again, big thanks to you and Fabio for feedback, I appreciate it :)




With regards,
Pavel Skripkin

  reply	other threads:[~2021-08-21 10:42 UTC|newest]

Thread overview: 118+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 17:07 Pavel Skripkin
2021-08-20 17:07 ` [PATCH RFC 1/3] staging: r8188eu: add proper rtw_read* error handling Pavel Skripkin
2021-08-20 21:50   ` Pavel Skripkin
2021-08-20 23:41   ` Phillip Potter
2021-08-21  5:55   ` Fabio M. De Francesco
2021-08-21 10:35     ` Pavel Skripkin
2021-08-21 12:11       ` Fabio M. De Francesco
2021-08-20 17:07 ` [PATCH RFC 2/3] staging: r8188eu: add error handling to ReadFuse Pavel Skripkin
2021-08-20 23:51   ` Phillip Potter
2021-08-21  3:59     ` Fabio M. De Francesco
2021-08-20 17:07 ` [PATCH RFC 3/3] staging: r8188eu: add error argument to read_macreg Pavel Skripkin
2021-08-20 23:18   ` Phillip Potter
2021-08-21 10:38     ` Pavel Skripkin
2021-08-20 23:12 ` [PATCH RFC 0/3] staging: r8188eu: avoid uninit value bugs Phillip Potter
2021-08-21 10:42   ` Pavel Skripkin [this message]
2021-08-22  9:53 ` Fabio M. De Francesco
2021-08-22 10:09   ` Pavel Skripkin
2021-08-22 10:59     ` Fabio M. De Francesco
2021-08-22 11:34       ` Fabio M. De Francesco
2021-08-22 12:10       ` Pavel Skripkin
2021-08-22 12:39         ` Greg KH
2021-08-22 12:50           ` Pavel Skripkin
2021-08-22 13:06             ` Greg KH
2021-08-22 13:21           ` Fabio M. De Francesco
2021-08-22 13:30             ` Greg KH
2021-08-22 13:31             ` Pavel Skripkin
2021-08-22 14:35               ` [PATCH RFC v2 0/6] " Pavel Skripkin
2021-08-22 14:35                 ` [PATCH RFC v2 1/6] staging: r8188eu: remove {read,write}_macreg Pavel Skripkin
2021-08-22 14:35                 ` [PATCH RFC v2 2/6] staging: r8188eu: add helper macro for printing registers Pavel Skripkin
2021-08-22 14:35                 ` [PATCH RFC v2 3/6] staging: r8188eu: add error handling of rtw_read8 Pavel Skripkin
2021-08-22 14:35                 ` [PATCH RFC v2 4/6] staging: r8188eu: add error handling of rtw_read16 Pavel Skripkin
2021-08-22 14:36                 ` [PATCH RFC v2 5/6] staging: r8188eu: add error handling of rtw_read32 Pavel Skripkin
2021-08-23 23:33                   ` Phillip Potter
2021-08-24  0:10                     ` Fabio M. De Francesco
2021-08-24  6:40                       ` Pavel Skripkin
2021-08-24  8:38                         ` Fabio M. De Francesco
2021-08-24  8:47                           ` Pavel Skripkin
2021-08-24  8:53                             ` Pavel Skripkin
2021-08-24  9:46                               ` Fabio M. De Francesco
2021-08-24 22:10                               ` Phillip Potter
2021-08-24 22:07                             ` Phillip Potter
2021-08-24  6:53                     ` Pavel Skripkin
2021-08-24  7:25                     ` [PATCH v3 0/6] staging: r8188eu: avoid uninit value bugs Pavel Skripkin
2021-08-24  7:27                       ` [PATCH v3 1/6] staging: r8188eu: remove {read,write}_macreg Pavel Skripkin
2021-08-26 10:39                         ` Greg KH
2021-08-26 10:40                         ` Greg KH
2021-08-24  7:27                       ` [PATCH v3 2/6] staging: r8188eu: add helper macro for printing registers Pavel Skripkin
2021-08-26 10:37                         ` Greg KH
2021-08-24  7:27                       ` [PATCH v3 3/6] staging: r8188eu: add error handling of rtw_read8 Pavel Skripkin
2021-08-25 12:05                         ` kernel test robot
2021-08-25 12:17                           ` Pavel Skripkin
2021-08-25 12:51                             ` Dan Carpenter
2021-08-25 13:02                               ` Pavel Skripkin
2021-08-25 13:34                                 ` Dan Carpenter
2021-08-25 13:44                                   ` Pavel Skripkin
2021-08-25 17:11                                     ` Nick Desaulniers
2021-08-26 11:08                                       ` Dan Carpenter
2021-08-25 23:45                         ` Fabio M. De Francesco
2021-08-26  5:13                           ` Pavel Skripkin
2021-08-26  8:21                         ` David Laight
2021-08-26  8:27                           ` Pavel Skripkin
2021-08-26 10:19                             ` David Laight
2021-08-26 11:21                               ` Dan Carpenter
2021-08-27  8:14                                 ` David Laight
2021-08-27  8:22                                   ` Pavel Skripkin
2021-08-27  9:07                         ` Dan Carpenter
2021-08-27  9:16                           ` Pavel Skripkin
2021-08-27  9:23                             ` Dan Carpenter
2021-08-30 11:21                         ` kernel test robot
2021-08-24  7:27                       ` [PATCH v3 4/6] staging: r8188eu: add error handling of rtw_read16 Pavel Skripkin
2021-08-25  4:35                         ` Fabio M. De Francesco
2021-08-25  8:22                           ` Pavel Skripkin
2021-08-25  9:48                             ` Fabio M. De Francesco
2021-08-25  9:55                               ` Pavel Skripkin
2021-08-25 10:06                                 ` Dan Carpenter
2021-08-25 10:13                                   ` Pavel Skripkin
2021-08-25 10:38                                     ` Dan Carpenter
2021-08-25 10:41                                       ` Pavel Skripkin
2021-08-25 11:06                                       ` Fabio M. De Francesco
2021-08-25 11:11                                         ` Fabio M. De Francesco
2021-08-25 11:31                                         ` Dan Carpenter
2021-08-25 12:11                                           ` Fabio M. De Francesco
2021-08-25 10:51                                 ` Fabio M. De Francesco
2021-08-26 10:50                         ` Greg KH
2021-08-26 10:58                           ` Pavel Skripkin
2021-08-24  7:27                       ` [PATCH v3 5/6] staging: r8188eu: add error handling of rtw_read32 Pavel Skripkin
2021-08-25  4:40                         ` Fabio M. De Francesco
2021-08-26  8:51                         ` David Laight
2021-08-26  9:22                           ` Pavel Skripkin
2021-08-26  9:27                             ` Pavel Skripkin
2021-08-26 10:22                               ` David Laight
2021-08-26 10:55                                 ` Pavel Skripkin
2021-08-26 10:59                                   ` David Laight
2021-08-26 20:03                                     ` Pavel Skripkin
2021-08-27  7:12                                       ` gregkh
2021-08-27  7:16                                         ` Pavel Skripkin
2021-08-24  7:27                       ` [PATCH v3 6/6] staging: r8188eu: make ReadEFuse return an int Pavel Skripkin
2021-08-25 10:13                       ` [PATCH v3 0/6] staging: r8188eu: avoid uninit value bugs Fabio M. De Francesco
2021-08-27  7:49                       ` Kari Argillander
2021-08-27  7:52                         ` Pavel Skripkin
2021-08-24  6:58                   ` [PATCH RFC v2 5/6] staging: r8188eu: add error handling of rtw_read32 Dan Carpenter
2021-08-24  7:01                     ` Pavel Skripkin
2021-08-24 15:07                       ` Fabio M. De Francesco
2021-08-22 14:36                 ` [PATCH RFC v2 6/6] staging: r8188eu: make ReadEFuse return an int Pavel Skripkin
2021-08-22 15:30                 ` [PATCH RFC v2 0/6] staging: r8188eu: avoid uninit value bugs Pavel Skripkin
2021-08-22 16:05                   ` Michael Straube
2021-08-22 16:26                     ` Pavel Skripkin
2021-08-22 23:52                       ` Phillip Potter
2021-08-22 17:36                 ` Fabio M. De Francesco
2021-08-22 17:38                   ` Pavel Skripkin
2021-08-22 20:06                     ` Fabio M. De Francesco
2021-08-22 20:19                       ` Pavel Skripkin
2021-08-23  0:12                 ` Phillip Potter
2021-08-23  6:38                   ` Pavel Skripkin
2021-08-23  6:44                   ` Pavel Skripkin
2021-08-22 16:03               ` [PATCH RFC 0/3] " Fabio M. De Francesco
2021-08-22 16:15                 ` Pavel Skripkin
2021-08-22 15:04             ` Phillip Potter

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