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Dataflow: Simplify revFlowThrough #18355

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Dataflow: Simplify revFlowThrough #18355

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29 changes: 9 additions & 20 deletions shared/dataflow/codeql/dataflow/internal/DataFlowImpl.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -2261,10 +2261,7 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {
returnAp = apNone()
or
// flow through a callable
exists(DataFlowCall call, ParamNodeEx p, Ap innerReturnAp |
revFlowThrough(call, returnCtx, p, state, _, returnAp, ap, innerReturnAp) and
flowThroughIntoCall(call, node, p, ap, innerReturnAp)
)
revFlowThrough(_, returnCtx, state, returnAp, ap, node)
or
// flow out of a callable
exists(ReturnPosition pos |
Expand Down Expand Up @@ -2413,11 +2410,14 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {

pragma[nomagic]
private predicate revFlowThrough(
DataFlowCall call, ReturnCtx returnCtx, ParamNodeEx p, FlowState state,
ReturnPosition pos, ApOption returnAp, Ap ap, Ap innerReturnAp
DataFlowCall call, ReturnCtx returnCtx, FlowState state, ApOption returnAp, Ap ap,
ArgNodeEx arg
) {
revFlowParamToReturn(p, state, pos, innerReturnAp, ap) and
revFlowIsReturned(call, returnCtx, returnAp, pos, innerReturnAp)
exists(ParamNodeEx p, ReturnPosition pos, Ap innerReturnAp |
flowThroughIntoCall(call, arg, p, ap, innerReturnAp) and
revFlowParamToReturn(p, state, pos, innerReturnAp, ap) and
revFlowIsReturned(call, returnCtx, returnAp, pos, innerReturnAp)
)
}

/**
Expand Down Expand Up @@ -2543,22 +2543,11 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {
)
}

pragma[nomagic]
private predicate revFlowThroughArg(
DataFlowCall call, ArgNodeEx arg, FlowState state, ReturnCtx returnCtx, ApOption returnAp,
Ap ap
) {
exists(ParamNodeEx p, Ap innerReturnAp |
revFlowThrough(call, returnCtx, p, state, _, returnAp, ap, innerReturnAp) and
flowThroughIntoCall(call, arg, p, ap, innerReturnAp)
)
}

pragma[nomagic]
predicate callMayFlowThroughRev(DataFlowCall call) {
exists(ArgNodeEx arg, FlowState state, ReturnCtx returnCtx, ApOption returnAp, Ap ap |
revFlow(arg, state, returnCtx, returnAp, ap) and
revFlowThroughArg(call, arg, state, returnCtx, returnAp, ap)
revFlowThrough(call, returnCtx, state, returnAp, ap, arg)
)
}

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