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gpio: GPIO_GET_LINEHANDLE_IOCTL: Validate line offset 

The line offset that is used as an index into the descs array is provided
by userspace and might go beyond the bounds of the array. If that happens
undefined behavior will occur.

Make sure that the offset is within the bounds of the desc array and reject
any requests that specify a value outside of it.

Cc: stable@vger.kernel.org
Fixes: d7c51b47ac ("gpio: userspace ABI for reading/writing GPIO lines")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Lars-Peter Clausen 2016-10-18 16:54:01 +02:00 committed by Linus Walleij
parent 0f4bbb2337
commit e405f9fcb6
1 changed files with 5 additions and 0 deletions
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5
drivers/gpio/gpiolib.c
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@ -444,6 +444,11 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
u32 lflags = handlereq.flags;
struct gpio_desc *desc;
if (offset >= gdev->ngpio) {
ret = -EINVAL;
goto out_free_descs;
}
desc = &gdev->descs[offset];
ret = gpiod_request(desc, lh->label);
if (ret)