sdl2: add checking for NULL

Sometimes SDL2 console can't be retrieved on events and scon variable
becomes NULL. This patch prevents processing of the events when the console
is not available.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Maria Klimushenkova <maria.klimushenkova@ispras.ru>
Message-id: 20180626064729.18070.47600.stgit@pasha-VirtualBox
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/ui/sdl2.c b/ui/sdl2.c
index 3fff9f5b630c9994f83f88aa426c49feb7652e68..76e59427cc7d9ba802893952df906b0a6cbb2d97 100644 (file)
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -438,7 +438,7 @@ static void handle_mousemotion(SDL_Event *ev)
     int max_x, max_y;
     struct sdl2_console *scon = get_scon_from_window(ev->motion.windowID);
 
-    if (!qemu_console_is_graphic(scon->dcl.con)) {
+    if (!scon || !qemu_console_is_graphic(scon->dcl.con)) {
         return;
     }
 
@@ -470,7 +470,7 @@ static void handle_mousebutton(SDL_Event *ev)
     SDL_MouseButtonEvent *bev;
     struct sdl2_console *scon = get_scon_from_window(ev->button.windowID);
 
-    if (!qemu_console_is_graphic(scon->dcl.con)) {
+    if (!scon || !qemu_console_is_graphic(scon->dcl.con)) {
         return;
     }
 
@@ -496,7 +496,7 @@ static void handle_mousewheel(SDL_Event *ev)
     SDL_MouseWheelEvent *wev = &ev->wheel;
     InputButton btn;
 
-    if (!qemu_console_is_graphic(scon->dcl.con)) {
+    if (!scon || !qemu_console_is_graphic(scon->dcl.con)) {
         return;
     }