[PATCH 06/10] server/red_worker: red_draw_qxl_drawable: protect from NULL dereference in case of buggy driver (or recording)

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

From: Alon Levy <alon@xxxxxxxxx>

---
 server/red_worker.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/server/red_worker.c b/server/red_worker.c
index 339b353..868de94 100644
--- a/server/red_worker.c
+++ b/server/red_worker.c
@@ -3838,6 +3838,11 @@ static void red_draw_qxl_drawable(RedWorker *worker, Drawable *drawable)
 
     image_cache_aging(&worker->image_cache);
 
+    if (!canvas) {
+        spice_warning("ignoring drawable to destroyed surface %d\n", drawable->surface_id);
+        return;
+    }
+
     region_add(&surface->draw_dirty_region, &drawable->red_drawable->bbox);
 
     switch (drawable->red_drawable->type) {
-- 
2.4.3

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