diff options
| author | Shreeya Patel <shreeya.patel@collabora.com> | 2022-03-21 16:32:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-13 21:59:23 +0300 |
| commit | 0912cf021fb5749372b3782611d8b1de4986c13a (patch) | |
| tree | 95e1af66bf5fced049443c2033e950f24599358b /include | |
| parent | 9ca11bd8222a612de0d2f54d050bfcf61ae2883f (diff) | |
| download | linux-0912cf021fb5749372b3782611d8b1de4986c13a.tar.xz | |
gpio: Restrict usage of GPIO chip irq members before initialization
commit 5467801f1fcbdc46bc7298a84dbf3ca1ff2a7320 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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/gpio/driver.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index a0f9901dcae6..e3c29d2e6826 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -225,6 +225,15 @@ struct gpio_irq_chip { unsigned int ngpios); /** + * @initialized: + * + * Flag to track GPIO chip irq member's initialization. + * This flag will make sure GPIO chip irq members are not used + * before they are initialized. + */ + bool initialized; + + /** * @valid_mask: * * If not %NULL, holds bitmask of GPIOs which are valid to be included |