From: Gabriel Knezek gabeknez@linux.microsoft.com
[ Upstream commit cb8f63b8cbf39845244f3ccae43bb7e63bd70543 ]
When userspace requests a GPIO v1 line info changed event, lineinfo_watch_read() populates and returns the gpioline_info_changed structure. It contains 5 words of padding at the end which are not initialized before being returned to userspace.
Zero the structure in gpio_v2_line_info_change_to_v1() before populating its contents.
Fixes: aad955842d1c ("gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL") Signed-off-by: Gabriel Knezek gabeknez@linux.microsoft.com Reviewed-by: Kent Gibson warthog618@gmail.com Signed-off-by: Bartosz Golaszewski bgolaszewski@baylibre.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpio/gpiolib-cdev.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 1631727bf0da..c7b5446d01fd 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -1880,6 +1880,7 @@ static void gpio_v2_line_info_changed_to_v1( struct gpio_v2_line_info_changed *lic_v2, struct gpioline_info_changed *lic_v1) { + memset(lic_v1, 0, sizeof(*lic_v1)); gpio_v2_line_info_to_v1(&lic_v2->info, &lic_v1->info); lic_v1->timestamp = lic_v2->timestamp_ns; lic_v1->event_type = lic_v2->event_type;