[PATCH v4 3/6] gpio: acpi: ignore out-of-range pins in acpi_gpiochip_alloc_event()

[Marco Scardovi]

Add a check to verify that the pin index retrieved from ACPI is within
the valid range for the GPIO chip (pin < chip->ngpio). If the pin is
out of range, an error is logged and the function returns early to
avoid invalid memory access.

Signed-off-by: Marco Scardovi <mscardovi95@xxxxxxxxx>
---
 drivers/gpio/gpiolib-acpi-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi-core.c b/drivers/gpio/gpiolib-acpi-core.c
index eb8a40cfb7a9..e53d68578024 100644
--- a/drivers/gpio/gpiolib-acpi-core.c
+++ b/drivers/gpio/gpiolib-acpi-core.c
@@ -370,6 +370,11 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
 	handle = ACPI_HANDLE(chip->parent);
 	pin = agpio->pin_table[0];
 
+	if (pin >= chip->ngpio) {
+		dev_err(chip->parent, "Failed to request GPIO for pin 0x%04X, out of range\n", pin);
+		return AE_OK;
+	}
+
 	if (pin <= 255) {
 		char ev_name[8];
 		sprintf(ev_name, "_%c%02X",
-- 
2.54.0