================
@@ -1183,6 +1315,20 @@ void StreamChecker::evalGetdelim(const FnDescription
*Desc,
State->BindExpr(E.CE, C.getLocationContext(), RetVal);
StateNotFailed =
E.assumeBinOpNN(StateNotFailed, BO_GE, RetVal, E.getZeroVal(Call));
+ // The buffer size `*n` must be enough to hold the whole line, and
+ // greater than the return value, since it has to account for '\0'.
+ auto SizePtrSval = Call.getArgSVal(1);
+ auto NVal = getPointeeDefVal(SizePtrSval, State);
+ if (NVal) {
+ StateNotFailed = StateNotFailed->assume(
+ E.SVB
+ .evalBinOp(StateNotFailed, BinaryOperator::Opcode::BO_GT, *NVal,
+ RetVal, E.SVB.getConditionType())
+ .castAs<DefinedOrUnknownSVal>(),
+ true);
----------------
alejandro-alvarez-sonarsource wrote:
It doesn't, since the `n` got invalidated first. Anyway, I have added two more
tests.
https://github.com/llvm/llvm-project/pull/83027
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