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winsys: glx: fix crash when inspecting onscreens

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An unallocated onscreen might have a NULL winsys field.

https://bugzilla.gnome.org/show_bug.cgi?id=754888
This commit is contained in:
Lionel Landwerlin 2015-09-11 17:29:15 +02:00
parent 4cb750928e
commit 00ea695ce2
1 changed files with 1 additions and 1 deletions
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2
cogl/winsys/cogl-winsys-glx.c
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@ -180,7 +180,7 @@ find_onscreen_for_xid (CoglContext *context, uint32_t xid)
/* Does the GLXEvent have the GLXDrawable or the X Window? */
xlib_onscreen = COGL_ONSCREEN (framebuffer)->winsys;
if (xlib_onscreen->xwin == (Window)xid)
if (xlib_onscreen != NULL && xlib_onscreen->xwin == (Window)xid)
return COGL_ONSCREEN (framebuffer);
}