Handle crash when passing arguments of wrong type in embedded application

When passing arguments of wrong type in the scriptableapplication
example, PyRun_String() fails and a crash occurs (NameError: name
'AppLib' is not defined). Catch this and return nullptr to get at
an error message.

Change-Id: Ie22cf81ebb0c390bb31684eadf19b682e4487361
Reviewed-by: Christian Tismer <tismer@stackless.com>
(cherry picked from commit 7d6ea931fdc0d919ac9fa5ddadeb931c2578151f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/sources/shiboken6/libshiboken/signature/signature.cpp b/sources/shiboken6/libshiboken/signature/signature.cpp
index 699488ec9..243f3e35f 100644
--- a/sources/shiboken6/libshiboken/signature/signature.cpp
+++ b/sources/shiboken6/libshiboken/signature/signature.cpp
@@ -513,6 +513,9 @@ static PyObject *adjustFuncName(const char *func_name)
 
     // Run `eval` on the type string to get the object.
     AutoDecRef obtype(PyRun_String(_path, Py_eval_input, ns, ns));
+    if (obtype.isNull())
+        return nullptr;
+
     if (PyModule_Check(obtype.object())) {
         // This is a plain function. Return the unmangled name.
         return String::fromCString(func_name);