[pim/kdepim-addons] /: Check potential crash

Git commit 718a82b0da4344652e9c73fcd050cdb70eea4fa1 by Laurent Montel.
Committed on 16/08/2026 at 15:14.
Pushed by mlaurent into branch 'master'.

Check potential crash

M  +6    -1    kmail/editorconvertertextplugins/markdown/markdownlib/markdownconverter.cpp
M  +6    -1    plugins/messageviewer/bodypartformatter/markdown/markdowndiscount.cpp

https://invent.kde.org/pim/kdepim-addons/-/commit/718a82b0da4344652e9c73fcd050cdb70eea4fa1

diff --git a/kmail/editorconvertertextplugins/markdown/markdownlib/markdownconverter.cpp b/kmail/editorconvertertextplugins/markdown/markdownlib/markdownconverter.cpp
index 8a33deffc..d756a4f0f 100644
--- a/kmail/editorconvertertextplugins/markdown/markdownlib/markdownconverter.cpp
+++ b/kmail/editorconvertertextplugins/markdown/markdownlib/markdownconverter.cpp
@@ -107,8 +107,13 @@ QString MarkdownConverter::convertTextToMarkdown(const QString &str)
     }
     mkd_free_flags(flags);
 #endif
-    char *htmlDocument;
+    char *htmlDocument = nullptr;
     const int size = mkd_document(markdownHandle, &htmlDocument);
+    if (size < 0 || !htmlDocument) {
+        qWarning() << "Failed to generate the Markdown document.";
+        mkd_cleanup(markdownHandle);
+        return {};
+    }
 
     const QString html = QString::fromUtf8(htmlDocument, size);
 
diff --git a/plugins/messageviewer/bodypartformatter/markdown/markdowndiscount.cpp b/plugins/messageviewer/bodypartformatter/markdown/markdowndiscount.cpp
index 98ecf93b8..958d741e4 100644
--- a/plugins/messageviewer/bodypartformatter/markdown/markdowndiscount.cpp
+++ b/plugins/messageviewer/bodypartformatter/markdown/markdowndiscount.cpp
@@ -48,8 +48,13 @@ QString MarkdownDiscount::toHtml() const
     mkd_free_flags(flags);
 #endif
 
-    char *htmlDocument;
+    char *htmlDocument = nullptr;
     const int size = mkd_document(markdownHandle, &htmlDocument);
+    if (size < 0 || !htmlDocument) {
+        qWarning() << "Failed to generate the Markdown document.";
+        mkd_cleanup(markdownHandle);
+        return {};
+    }
 
     const QString html = QString::fromUtf8(htmlDocument, size);
     mkd_cleanup(markdownHandle);