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gpio: Verify validity of pin offsets from device trees

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Translation of an OF GPIO specifier should fail if the pin offset is
larger than the number of pins in the GPIO bank.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Samuel Holland 2021-09-11 17:05:52 -05:00 committed by Tom Rini
parent 390ccffe07
commit 37c10bf7ef
1 changed files with 4 additions and 0 deletions
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4
drivers/gpio/gpio-uclass.c
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@ -189,10 +189,14 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (args->args_count < 1)
return -EINVAL;
desc->offset = args->args[0];
if (desc->offset >= uc_priv->gpio_count)
return -EINVAL;
if (args->args_count < 2)
return 0;