[PATCH v4 0/4] staging: r8188eu: add error handling of usb read errors

[Pavel Skripkin]

Hi,

it's reincarnation of my old series for adding sane error handling in
r8818eu.

*Problem*

Old code was returning just stack variable in case of read error. It's
not the best approach, since passing around stack data might cause
device misconfiguration or even kernel data leakage

To solve this I've changed rtw_read{8,16,32} prototypes to return an error via
return value and data via passed pointer. Some work should be done to
propogate an error down to calltrace, but it's good way to at least
start doing sane I/O error handling

Tested locally on qemu with TP-Link TL-WN722N v2/v3 [Realtek RTL8188EUS]
device. More testing is welcomed, of course :)

_NOTE_
Series is based on top of staging-testing branch.

Changes since v3:
    fix build error in 1/4 caused by unused local variable

Changes since v2:
    get rid of `(void)res` and return an error from function instead of
    hiding it

Changes since v1:
    addresses issues found by Dan and self review. Mostly related to returning
    _FAIL instead of -errno, since callers expect _FAIL/_SUCCESS

v1: https://lore.kernel.org/linux-staging/cover.1652911343.git.paskripkin@xxxxxxxxx/
v2: https://lore.kernel.org/linux-staging/cover.1652994483.git.paskripkin@xxxxxxxxx/
v3: https://lore.kernel.org/linux-staging/cover.1654543286.git.paskripkin@xxxxxxxxx/

Pavel Skripkin (4):
  staging: r8188eu: add error handling of rtw_read8
  staging: r8188eu: add error handling of rtw_read16
  staging: r8188eu: add error handling of rtw_read32
  MAINTAINERS: add myself as r8188eu reviewer

 MAINTAINERS                                   |   1 +
 drivers/staging/r8188eu/core/rtw_cmd.c        |  15 +-
 drivers/staging/r8188eu/core/rtw_efuse.c      |  33 ++-
 drivers/staging/r8188eu/core/rtw_fw.c         |  72 +++--
 drivers/staging/r8188eu/core/rtw_led.c        |  16 +-
 drivers/staging/r8188eu/core/rtw_mlme_ext.c   |  62 ++++-
 drivers/staging/r8188eu/core/rtw_pwrctrl.c    |   9 +-
 drivers/staging/r8188eu/core/rtw_wlan_util.c  |  20 +-
 .../r8188eu/hal/Hal8188ERateAdaptive.c        |  21 +-
 drivers/staging/r8188eu/hal/HalPhyRf_8188e.c  |  21 +-
 drivers/staging/r8188eu/hal/HalPwrSeqCmd.c    |   9 +-
 drivers/staging/r8188eu/hal/hal_com.c         |  27 +-
 drivers/staging/r8188eu/hal/rtl8188e_cmd.c    |  37 ++-
 drivers/staging/r8188eu/hal/rtl8188e_dm.c     |   6 +-
 .../staging/r8188eu/hal/rtl8188e_hal_init.c   | 136 +++++++---
 drivers/staging/r8188eu/hal/rtl8188e_phycfg.c |  30 ++-
 drivers/staging/r8188eu/hal/usb_halinit.c     | 251 +++++++++++++++---
 drivers/staging/r8188eu/hal/usb_ops_linux.c   |  33 ++-
 drivers/staging/r8188eu/include/rtw_io.h      |   6 +-
 drivers/staging/r8188eu/os_dep/ioctl_linux.c  |  47 +++-
 drivers/staging/r8188eu/os_dep/os_intfs.c     |  19 +-
 21 files changed, 693 insertions(+), 178 deletions(-)

-- 
2.36.1