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authorGabriel Knezek <gabeknez@linux.microsoft.com>2021-06-21 15:28:59 -0700
committerBartosz Golaszewski <bgolaszewski@baylibre.com>2021-06-22 09:54:13 +0200
commitcb8f63b8cbf39845244f3ccae43bb7e63bd70543 (patch)
tree1b6267bdc7e0e75bdb730ed75276077e7c458941 /drivers/gpio/gpiolib-cdev.c
parent3093e6cca3ba7d47848068cb256c489675125181 (diff)
gpiolib: cdev: zero padding during conversion to gpioline_info_changed
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>
Diffstat (limited to 'drivers/gpio/gpiolib-cdev.c')
-rw-r--r--drivers/gpio/gpiolib-cdev.c1
1 files changed, 1 insertions, 0 deletions
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;