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gpio: stm32: check result of ofnode_phandle_args

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Add test on the size of ofnode_phandle_args result to avoid access
to uninitialized elements in args[] field.

This patch avoids the issue when gpio-ranges cell size is not 3 as
expected, for example:
	gpio-ranges = <&pinctrl 0>;
instead of
	gpio-ranges = <&pinctrl 0 112 16>;

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2020-09-09 18:28:34 +02:00
parent 15c8cbfc74
commit cb08e84d68
1 changed files with 5 additions and 0 deletions
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5
drivers/gpio/stm32_gpio.c
View file

@ -295,6 +295,9 @@ static int gpio_stm32_probe(struct udevice *dev)
ret = dev_read_phandle_with_args(dev, "gpio-ranges", ret = dev_read_phandle_with_args(dev, "gpio-ranges",
NULL, 3, i, &args); NULL, 3, i, &args);
if (!ret && args.args_count < 3)
return -EINVAL;
if (ret == -ENOENT) { if (ret == -ENOENT) {
uc_priv->gpio_count = STM32_GPIOS_PER_BANK; uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
priv->gpio_range = GENMASK(STM32_GPIOS_PER_BANK - 1, 0); priv->gpio_range = GENMASK(STM32_GPIOS_PER_BANK - 1, 0);
@ -308,6 +311,8 @@ static int gpio_stm32_probe(struct udevice *dev)
ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3, ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
++i, &args); ++i, &args);
if (!ret && args.args_count < 3)
return -EINVAL;
} }
dev_dbg(dev, "addr = 0x%p bank_name = %s gpio_count = %d gpio_range = 0x%x\n", dev_dbg(dev, "addr = 0x%p bank_name = %s gpio_count = %d gpio_range = 0x%x\n",