Shreeya Patel f8dea54f74 gpio: Restrict usage of GPIO chip irq members before initialization ... commit 5467801f1f upstream. GPIO chip irq members are exposed before they could be completely initialized and this leads to race conditions. One such issue was observed for the gc->irq.domain variable which was accessed through the I2C interface in gpiochip_to_irq() before it could be initialized by gpiochip_add_irqchip(). This resulted in Kernel NULL pointer dereference. Following are the logs for reference :- kernel: Call Trace: kernel: gpiod_to_irq+0x53/0x70 kernel: acpi_dev_gpio_irq_get_by+0x113/0x1f0 kernel: i2c_acpi_get_irq+0xc0/0xd0 kernel: i2c_device_probe+0x28a/0x2a0 kernel: really_probe+0xf2/0x460 kernel: RIP: 0010:gpiochip_to_irq+0x47/0xc0 To avoid such scenarios, restrict usage of GPIO chip irq members before they are completely initialized. Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com> Cc: stable@vger.kernel.org Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-04-13 19:27:38 +02:00
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aspeed.h	gpio: aspeed: Add interfaces for co-processor to grab GPIOs	2018-07-02 16:10:15 +02:00
consumer.h	gpiolib: acpi: Remove never used devm_acpi_dev_remove_driver_gpios()	2021-11-15 13:31:44 +02:00
driver.h	gpio: Restrict usage of GPIO chip irq members before initialization	2022-04-13 19:27:38 +02:00
gpio-reg.h	gpio: Add comments on #if/#else/#endif	2019-06-27 15:56:50 +01:00
machine.h	gpiolib: provide gpiod_remove_hogs()	2021-12-17 12:26:12 +01:00
regmap.h	gpio: regmap: move drvdata to config data	2021-06-07 15:39:19 +02:00