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Tue, 19 May 2026 00:00:44 -0700 (PDT) From: "Marco Scardovi (scardracs)" To: mika.westerberg@linux.intel.com Cc: andriy.shevchenko@linux.intel.com, brgl@kernel.org, linusw@kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, mscardovi95@gmail.com, westeri@kernel.org Subject: [PATCH 1/2] gpiolib: acpi: Add robust bounds-checking for GPIO pin resources Date: Tue, 19 May 2026 09:00:30 +0200 Message-ID: <20260519070039.9280-2-mscardovi95@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260519070039.9280-1-mscardovi95@gmail.com> References: <20260518103302.GO84797@black.igk.intel.com> <20260519070039.9280-1-mscardovi95@gmail.com> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Ensure that the GPIO pin resource arrays are safely bounded before accessing indices. Add bounds checking in acpi_request_own_gpiod(), acpi_gpio_irq_is_wake(), acpi_gpiochip_alloc_event(), and acpi_gpio_adr_space_handler() to prevent out-of-bounds array reads if the ACPI namespace provides malformed or empty pin tables. Assisted-by: Antigravity:gemini-3-flash Signed-off-by: Marco Scardovi --- drivers/gpio/gpiolib-acpi-core.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi-core.c b/drivers/gpio/gpiolib-acpi-core.c index eb8a40cfb7a9..d381631ba6f0 100644 --- a/drivers/gpio/gpiolib-acpi-core.c +++ b/drivers/gpio/gpiolib-acpi-core.c @@ -322,9 +322,14 @@ static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip, { int polarity = GPIO_ACTIVE_HIGH; enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity); - unsigned int pin = agpio->pin_table[index]; + unsigned int pin; struct gpio_desc *desc; + if (index >= agpio->pin_table_length) + return ERR_PTR(-EINVAL); + + pin = agpio->pin_table[index]; + desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags); if (IS_ERR(desc)) return desc; @@ -337,7 +342,12 @@ static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip, static bool acpi_gpio_irq_is_wake(struct device *parent, const struct acpi_resource_gpio *agpio) { - unsigned int pin = agpio->pin_table[0]; + unsigned int pin; + + if (agpio->pin_table_length == 0) + return false; + + pin = agpio->pin_table[0]; if (agpio->wake_capable != ACPI_WAKE_CAPABLE) return false; @@ -367,6 +377,9 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares, if (!acpi_gpio_get_irq_resource(ares, &agpio)) return AE_OK; + if (agpio->pin_table_length == 0) + return AE_OK; + handle = ACPI_HANDLE(chip->parent); pin = agpio->pin_table[0]; @@ -1110,6 +1123,11 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, return AE_BAD_PARAMETER; } + if (pin_index >= agpio->pin_table_length) { + ACPI_FREE(ares); + return AE_BAD_PARAMETER; + } + length = min(agpio->pin_table_length, pin_index + bits); for (i = pin_index; i < length; ++i) { unsigned int pin = agpio->pin_table[i]; -- 2.54.0