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- fixed: DecoHandleRuntimeState must check all parent classes when trying to determine if the target is a valid state. It should also ensure that both the calling and target state belong to the same actor. Although unlikely it cannot be entirely ruled out that a bogus index randomly points to a seemingly valid state elsewhere.

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This commit is contained in:
Christoph Oelckers 2016-10-04 09:28:19 +02:00
parent 594b344be9
commit 15cbf4bae6
1 changed files with 20 additions and 1 deletions
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21
src/thingdef/thingdef_expression.cpp
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@ -4956,6 +4956,25 @@ FxExpression *FxRuntimeStateIndex::Resolve(FCompileContext &ctx)
return this;
}
static bool VerifyJumpTarget(AActor *stateowner, FStateParamInfo *stateinfo, int index)
{
PClassActor *cls = stateowner->GetClass();
while (cls != RUNTIME_CLASS(AActor))
{
// both calling and target state need to belong to the same class.
if (cls->OwnsState(stateinfo->mCallingState))
{
return cls->OwnsState(stateinfo->mCallingState + index);
}
// We can safely assume the ParentClass is of type PClassActor
// since we stop when we see the Actor base class.
cls = static_cast<PClassActor *>(cls->ParentClass);
}
return false;
}
static int DecoHandleRuntimeState(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
{
PARAM_PROLOGUE;
@ -4963,7 +4982,7 @@ static int DecoHandleRuntimeState(VMFrameStack *stack, VMValue *param, int numpa
PARAM_POINTER(stateinfo, FStateParamInfo);
PARAM_INT(index);
if (index == 0 || !stateowner->GetClass()->OwnsState(stateinfo->mCallingState + index))
if (index == 0 || !VerifyJumpTarget(stateowner, stateinfo, index))
{
// Null is returned if the location was invalid which means that no jump will be performed
// if used as return value