[PATCH v2 0/4] staging: r8188eu: add error handling of usb read errors

Pavel Skripkin
2022-05-19T21:09:56Z

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 and should be
applied after Dan's patch https://lore.kernel.org/linux-staging/YoXS4OaD1oauPvmj@kili/

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@gmail.com/

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 | 130 +++++++---
drivers/staging/r8188eu/hal/rtl8188e_phycfg.c | 30 ++-
drivers/staging/r8188eu/hal/usb_halinit.c | 240 +++++++++++++++---
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, 679 insertions(+), 175 deletions(-)

--
2.36.1