[PATCH weston 2/2] xwm: check whether the picked seat can be NULL

[Boyan Ding]

The seat picked in weston_wm_window_handle_moveresize can sometimes
be NULL when it is (somehow) triggered with all buttons released.

This patch checks whether the seat is NULL to avoid NULL dereference.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=80837
Signed-off-by: Boyan Ding <stu_dby at 126.com>
---
 xwayland/window-manager.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xwayland/window-manager.c b/xwayland/window-manager.c
index f64ef94..6e74b89 100644
--- a/xwayland/window-manager.c
+++ b/xwayland/window-manager.c
@@ -1250,8 +1250,8 @@ weston_wm_window_handle_moveresize(struct weston_wm_window *window,
 	struct weston_shell_interface *shell_interface =
 		&wm->server->compositor->shell_interface;
 
-	if (seat->pointer->button_count != 1 || !window->view
-	    || seat->pointer->focus != window->view)
+	if (seat == NULL || seat->pointer->button_count != 1
+	    || !window->view || seat->pointer->focus != window->view)
 		return;
 
 	detail = client_message->data.data32[2];
-- 
2.0.1