linux-kernel - Re: [PATCH v3] gpio: Restrict usage of GPIO chip irq members before initialization

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Date:   Thu, 24 Mar 2022 23:45:45 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Shreeya Patel <shreeya.patel@...labora.com>
Cc:     brgl@...ev.pl, krisman@...labora.com, andy.shevchenko@...il.com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, alvaro.soliverez@...labora.com
Subject: Re: [PATCH v3] gpio: Restrict usage of GPIO chip irq members before initialization

On Mon, Mar 21, 2022 at 2:33 PM Shreeya Patel
<shreeya.patel@...labora.com> wrote:

> 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@...labora.com>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij