qt5-qtwayland/0005-Scanner-Avoid-accessing-dangling-pointers-in-destroy.patch

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From e5c272423d1bba2825086b82fd97499237a6fa4b Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Fri, 30 Oct 2020 16:55:30 +0200
2021-12-06 15:08:41 +00:00
Subject: [PATCH 05/36] Scanner: Avoid accessing dangling pointers in
destroy_func()
Usually, the object associated with the resource gets destroyed in the
destroy_resource() function.
Therefore, we need to double-check that the object is still alive before
trying to reset its m_resource.
Change-Id: I26408228f58919db17eb29584a1cbd4a9427d25c
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
(cherry picked from commit 735164b5c2a2637a8d53a8803a2401e4ef477ff0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
src/qtwaylandscanner/qtwaylandscanner.cpp | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/qtwaylandscanner/qtwaylandscanner.cpp b/src/qtwaylandscanner/qtwaylandscanner.cpp
index 1d635f06..e2f87bbd 100644
--- a/src/qtwaylandscanner/qtwaylandscanner.cpp
+++ b/src/qtwaylandscanner/qtwaylandscanner.cpp
@@ -814,7 +814,9 @@ bool Scanner::process()
printf(" if (Q_LIKELY(that)) {\n");
printf(" that->m_resource_map.remove(resource->client(), resource);\n");
printf(" that->%s_destroy_resource(resource);\n", interfaceNameStripped);
- printf(" if (that->m_resource == resource)\n");
+ printf("\n");
+ printf(" that = resource->%s_object;\n", interfaceNameStripped);
+ printf(" if (that && that->m_resource == resource)\n");
printf(" that->m_resource = nullptr;\n");
printf(" }\n");
printf(" delete resource;\n");
--
2021-12-06 15:08:41 +00:00
2.33.1