From 9b36512b9453f429644b0c388d381f7a2fc0f825 Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Mon, 13 May 2019 17:48:42 +0200
Subject: Avoid illegal downcasts in texture and shader handling

Fixes bad type-cast during destruction when objects no longer has the
full type they used to.

Detected by UBSAN.

Change-Id: I4867091901d70d5a882656834eb97a704def1751
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
---
 src/quick/items/qquickshadereffect.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/quick/items/qquickshadereffect.cpp')

diff --git a/src/quick/items/qquickshadereffect.cpp b/src/quick/items/qquickshadereffect.cpp
index ab79b69c8c..05d9e5e36d 100644
--- a/src/quick/items/qquickshadereffect.cpp
+++ b/src/quick/items/qquickshadereffect.cpp
@@ -795,7 +795,8 @@ bool QQuickShaderEffect::event(QEvent *e)
         return QQuickItem::event(e);
     }
 #endif
-    m_impl->handleEvent(e);
+    if (m_impl)
+        m_impl->handleEvent(e);
     return QQuickItem::event(e);
 }
 
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