1 files changed, 3 insertions, 0 deletions
diff --git a/src/corelib/serialization/qjsondocument.cpp b/src/corelib/serialization/qjsondocument.cpp
index 9794bca60d..ab27b45fda 100644
--- a/src/corelib/serialization/qjsondocument.cpp
+++ b/src/corelib/serialization/qjsondocument.cpp
@@ -210,6 +210,9 @@ QJsonDocument QJsonDocument::fromRawData(const char *data, int size, DataValidat
         return QJsonDocument();
     }
 
+    if (size < (int)(sizeof(QJsonPrivate::Header) + sizeof(QJsonPrivate::Base)))
+        return QJsonDocument();
+
     QJsonPrivate::Data *d = new QJsonPrivate::Data((char *)data, size);
     d->ownsData = false;