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[v2,0/2] gpiolib: don't allow user-space to crash the kernel with hot-unplugs

Message ID 20221128175214.602612-1-brgl@bgdev.pl
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Series gpiolib: don't allow user-space to crash the kernel with hot-unplugs | expand

Message

Bartosz Golaszewski Nov. 28, 2022, 5:52 p.m. UTC 
From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

This is a second iteration of the changes that aim at fixing the situation
in which the user-space can provoke a NULL-pointer derefence in the kernel
when a GPIO device that's in use by user-space is removed.

v1 -> v2:
- add missing gdev->chip checks in patch 1/2
- add a second patch that protects the structures that can be accessed
  by user-space calls against concurrent removal

Bartosz Golaszewski (2):
  gpiolib: cdev: fix NULL-pointer dereferences
  gpiolib: protect the GPIO device against being dropped while in use by
    user-space

 drivers/gpio/gpiolib-cdev.c | 240 +++++++++++++++++++++++++++++-------
 drivers/gpio/gpiolib.c      |   3 +
 drivers/gpio/gpiolib.h      |   5 +
 3 files changed, 205 insertions(+), 43 deletions(-)