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xwayland: Delete all frame_callback_list nodes in xwl_unrealize_window 

We were only calling xwl_present_unrealize_window for the toplevel
window, but the list can contain entries from child windows as well,
in which case we were leaving dangling pointers to freed memory.

Closes: https://gitlab.freedesktop.org/xorg/xserver/issues/1000
Fixes: c5067feaee "xwayland: Use single frame callback for Present
                     flips and normal updates"
Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
Tested-by: Olivier Fourdan <ofourdan@redhat.com>
This commit is contained in:
Michel Dänzer 2020-03-17 11:45:22 +01:00 committed by Michel Dänzer
parent 5b9010fa6b
commit 5e91587302
3 changed files with 11 additions and 10 deletions
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8
hw/xwayland/xwayland-present.c
View File

@ -524,14 +524,8 @@ xwl_present_flips_stop(WindowPtr window)
}
void
xwl_present_unrealize_window(WindowPtr window)
xwl_present_unrealize_window(struct xwl_present_window *xwl_present_window)
{
struct xwl_present_window *xwl_present_window = xwl_present_window_priv(window);
if (!xwl_present_window ||
xorg_list_is_empty(&xwl_present_window->frame_callback_list))
return;
/* The pending frame callback may never be called, so drop it and shorten
* the frame timer interval.
*/

2
hw/xwayland/xwayland-present.h
View File

@ -67,7 +67,7 @@ struct xwl_present_event {
void xwl_present_frame_callback(struct xwl_present_window *xwl_present_window);
Bool xwl_present_init(ScreenPtr screen);
void xwl_present_cleanup(WindowPtr window);
void xwl_present_unrealize_window(WindowPtr window);
void xwl_present_unrealize_window(struct xwl_present_window *xwl_present_window);
#endif /* GLAMOR_HAS_GBM */

11
hw/xwayland/xwayland-window.c
View File

@ -607,8 +607,15 @@ xwl_unrealize_window(WindowPtr window)
wl_callback_destroy(xwl_window->frame_callback);
#ifdef GLAMOR_HAS_GBM
if (xwl_screen->present)
xwl_present_unrealize_window(window);
if (xwl_screen->present) {
struct xwl_present_window *xwl_present_window, *tmp;
xorg_list_for_each_entry_safe(xwl_present_window, tmp,
&xwl_window->frame_callback_list,
frame_callback_list) {
xwl_present_unrealize_window(xwl_present_window);
}
}
#endif
free(xwl_window);