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gpio: use kzalloc to allocate gpio_device

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The use of kmalloc() to allocate the gpio_device leaves the contained struct
device object in an unknown state.  Calling dev_set_name() on a struct device
of unknown state can trigger the free() of an invalid pointer, as seen in the
following backtrace (collected by Tony Lindgren):

  kfree
  kobject_set_name_vargs
  dev_set_name
  gpiochip_add_data
  omap_gpio_probe
  platform_drv_probe
  ...

Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reported-by: Michael Welling <mwelling@ieee.org>
Reported-by: Tony Lindgren <tony@atomide.com>
Tested-by: Michael Welling <mwelling@ieee.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Josh Cartwright <joshc@ni.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Josh Cartwright 2016-02-17 16:44:15 -06:00 committed by Linus Walleij
parent aaf2b3afb9
commit 969f07b445
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpiolib.c
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@ -435,7 +435,7 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
* First: allocate and populate the internal stat container, and
* set up the struct device.
*/
gdev = kmalloc(sizeof(*gdev), GFP_KERNEL);
gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
if (!gdev)
return -ENOMEM;
gdev->dev.bus = &gpio_bus_type;