From 6f592ea300dfc69343aef1e79c7df5579909d3e9 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@qt.io>
Date: Tue, 10 Sep 2019 16:22:15 +0200
Subject: [PATCH] rhi: gl: Avoid crash when reading back the swapchain
 backbuffer
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Change-Id: I9a632c06d8b9e666d99d0f135d3396d2de03f92a
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
---
 src/gui/rhi/qrhigles2.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gui/rhi/qrhigles2.cpp b/src/gui/rhi/qrhigles2.cpp
index 0329acd350e..4d91ac45bdb 100644
--- a/src/gui/rhi/qrhigles2.cpp
+++ b/src/gui/rhi/qrhigles2.cpp
@@ -1480,7 +1480,8 @@ void QRhiGles2::enqueueResourceUpdates(QRhiCommandBuffer *cb, QRhiResourceUpdate
             cmd.cmd = QGles2CommandBuffer::Command::ReadPixels;
             cmd.args.readPixels.result = u.read.result;
             QGles2Texture *texD = QRHI_RES(QGles2Texture, u.read.rb.texture());
-            trackedImageBarrier(cbD, texD, QGles2Texture::AccessRead);
+            if (texD)
+                trackedImageBarrier(cbD, texD, QGles2Texture::AccessRead);
             cmd.args.readPixels.texture = texD ? texD->texture : 0;
             if (texD) {
                 cmd.args.readPixels.w = texD->m_pixelSize.width();