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Check type of Squirrel constructor_stub() instance

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This prevents manual invocations of the native class constructor with an
invalid value.
This commit is contained in:
Alexander 'z33ky' Hirsch 2025-06-23 20:55:13 +02:00
parent 9c494b6eeb
commit 9c740a891e
1 changed files with 15 additions and 7 deletions
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14
sp/src/vscript/vscript_squirrel.cpp
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@ -1562,15 +1562,23 @@ SQInteger constructor_stub(HSQUIRRELVM vm)
Assert(pSquirrelVM);
sq_resetobject(&pSquirrelVM->lastError_);
{
SQUserPointer p;
if (SQ_FAILED(sq_getinstanceup(vm, 1, &p, 0)))
{
return SQ_ERROR;
}
if (!p)
{
return sq_throwerror(vm, "Accessed null instance");
}
void* instance = pClassDesc->m_pfnConstruct();
// expect construction to always succeed
Assert(sq_isnull(pSquirrelVM->lastError_));
{
SQUserPointer p;
sq_getinstanceup(vm, 1, &p, 0);
new(p) ClassInstanceData(instance, pClassDesc, nullptr, true);
}