V4: Check for exceptions before we use the result of a JS call

If the call resulted in an exception the return value is undefined.

Task-number: QTBUG-81581
Change-Id: Ibfdd5e1229cf5437f270232d3b1a91308adeec72
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4jsonobject.cpp b/src/qml/jsruntime/qv4jsonobject.cpp
index 936c032fad..ce759111f4 100644
--- a/src/qml/jsruntime/qv4jsonobject.cpp
+++ b/src/qml/jsruntime/qv4jsonobject.cpp
@@ -703,6 +703,8 @@ QString Stringify::Str(const QString &key, const Value &v)
             *jsCallData->thisObject = value;
             jsCallData->args[0] = v4->newString(key);
             value = toJSON->call(jsCallData);
+            if (v4->hasException)
+                return QString();
         }
     }
 
@@ -714,6 +716,8 @@ QString Stringify::Str(const QString &key, const Value &v)
         jsCallData->args[1] = value;
         *jsCallData->thisObject = holder;
         value = replacerFunction->call(jsCallData);
+        if (v4->hasException)
+            return QString();
     }
 
     o = value->asReturnedValue();