================
@@ -2515,6 +2517,53 @@ void CStringChecker::evalSprintfCommon(CheckerContext
&C, const CallEvent &Call,
C.addTransition(State);
}
+void CStringChecker::evalGetentropy(CheckerContext &C, const CallEvent &Call)
const {
+ DestinationArgExpr Buffer = {{Call.getArgExpr(0), 0}};
+ SizeArgExpr Size = {{Call.getArgExpr(1), 1}};
+ ProgramStateRef State = C.getState();
+ SValBuilder &SVB = C.getSValBuilder();
+ SVal MaxLength = SVB.makeIntVal(256, C.getASTContext().IntTy);
+
+ SVal SizeVal = C.getSVal(Size.Expression);
+ QualType SizeTy = Size.Expression->getType();
+
+ ProgramStateRef StateZeroSize, StateNonZeroSize;
+ std::tie(StateZeroSize, StateNonZeroSize) =
+ assumeZero(C, State, SizeVal, SizeTy);
+
+ if (StateZeroSize) {
+ StateZeroSize = State->BindExpr(Call.getOriginExpr(),
C.getLocationContext(),
+ SVB.makeZeroVal(C.getASTContext().IntTy));
+ C.addTransition(StateZeroSize);
+ return;
+ }
+
+ SVal Buff = C.getSVal(Buffer.Expression);
+ State = checkNonNull(C, StateNonZeroSize, Buffer, Buff);
+ if (!State)
+ return;
+
+ QualType cmpTy = C.getSValBuilder().getConditionType();
+ ProgramStateRef sizeAboveLimit, sizeNotAboveLimit;
+ std::tie(sizeAboveLimit, sizeNotAboveLimit) = State->assume(
+ SVB
+ .evalBinOpNN(State, BO_GT, *SizeVal.getAs<NonLoc>(),
*MaxLength.getAs<NonLoc>(), cmpTy)
----------------
NagyDonat wrote:
Declare `SizeVal` and `MaxLength` as `NonLoc` instead of doing this immediately
dereferenced `getAs()`. In the case of `SizeVal` you should do an early return
in the unlikely case when the value is not a `NonLoc`.
https://github.com/llvm/llvm-project/pull/83675
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