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console: add same surface replace pre-condition

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Catch an invalid state early, before a potential use-after-free. This is
mainly useful for documentation purposes.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20170406120513.638-2-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-04-06 14:05:11 +02:00 committed by Gerd Hoffmann
parent 32c7e0ab75
commit 6905b93447
1 changed files with 2 additions and 0 deletions
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ui/console.c
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@ -1538,6 +1538,8 @@ void dpy_gfx_replace_surface(QemuConsole *con,
DisplaySurface *old_surface = con->surface;
DisplayChangeListener *dcl;
assert(old_surface != surface);
con->surface = surface;
QLIST_FOREACH(dcl, &s->listeners, next) {
if (con != (dcl->con ? dcl->con : active_console)) {