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cogl/xlib-renderer: Save Xlib renderer data in custom winsys pointer

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XLib renderer saves its data as the object cogl user data, however this data
is free'd as part of the object destruction that happens before free'ing the
renderer in _cogl_renderer_free(), from where we're calling the renderer
disconnect vfunc.
Thus in _cogl_xlib_renderer_disconnect() we happen to get an invalid pointer to
CoglXlibRenderer and we try access to it in order to close the X11 display.

This causes all the cogl tests to crash when G_SLICE=always-malloc is set and
when using MALLOC_CHECK_.

Fix this using the renderer winsys custom data instead of using cogl object data
for storing the CoglXlibRenderer, and handling the destruction of it manually.

As bonus this also makes access to the renderer data faster.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/581
This commit is contained in:
Marco Trevisan (Treviño) 2019-05-17 14:28:01 -05:00
parent f99cd18254
commit 61c173b777
1 changed files with 7 additions and 19 deletions
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26
cogl/cogl/cogl-xlib-renderer.c
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@ -54,41 +54,27 @@ static char *_cogl_x11_display_name = NULL;
static GList *_cogl_xlib_renderers = NULL;
static void
destroy_xlib_renderer_data (void *user_data)
_xlib_renderer_data_free (CoglXlibRenderer *data)
{
CoglXlibRenderer *data = user_data;
if (data->xvisinfo)
XFree (data->xvisinfo);
g_slice_free (CoglXlibRenderer, user_data);
g_slice_free (CoglXlibRenderer, data);
}
CoglXlibRenderer *
_cogl_xlib_renderer_get_data (CoglRenderer *renderer)
{
static CoglUserDataKey key;
CoglXlibRenderer *data;
/* Constructs a CoglXlibRenderer struct on demand and attaches it to
the object using user data. It's done this way instead of using a
subclassing hierarchy in the winsys data because all EGL winsys's
need the EGL winsys data but only one of them wants the Xlib
data. */
data = cogl_object_get_user_data (COGL_OBJECT (renderer), &key);
if (!renderer->custom_winsys_user_data)
renderer->custom_winsys_user_data = g_slice_new0 (CoglXlibRenderer);
if (data == NULL)
{
data = g_slice_new0 (CoglXlibRenderer);
cogl_object_set_user_data (COGL_OBJECT (renderer),
&key,
data,
destroy_xlib_renderer_data);
}
return data;
return renderer->custom_winsys_user_data;
}
static void
@ -570,6 +556,8 @@ _cogl_xlib_renderer_disconnect (CoglRenderer *renderer)
if (!renderer->foreign_xdpy && xlib_renderer->xdpy)
XCloseDisplay (xlib_renderer->xdpy);
g_clear_pointer (&renderer->custom_winsys_user_data, _xlib_renderer_data_free);
unregister_xlib_renderer (renderer);
}