Input: potential info leak in input_event_to_user()

Smatch has a new check for Rosenberg type information leaks where structs are copied to the user with uninitialized stack data in them.

The issue here is that struct input_event_compat has a hole in it.

struct input_event_compat {
        struct compat_timeval {
        } time;                             /*     0     0 */

        /* XXX 8 bytes hole, try to pack */

        short unsigned int         type;    /*     8     2 */

Signed-off-by Dan Carpenter <[email protected]>

drivers/input/input-compat.c +2 -0

index e46a867..007850a 100644
@@ -44,6 +44,8 @@ int input_event_to_user(char __user *buffer,
 	if (INPUT_COMPAT_TEST) {
 		struct input_event_compat compat_event;
 
+		memset(&compat_event, 0, sizeof(compat_event));
+
 		compat_event.time.tv_sec = event->time.tv_sec;
 		compat_event.time.tv_usec = event->time.tv_usec;
 		compat_event.type = event->type;