[clang] [clang][analyzer] fix crash when modelling 'getline' function in checkers (PR #145229)

[Balazs Benics via cfe-commits]

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@@ -1518,14 +1518,19 @@ void MallocChecker::checkGetdelim(ProgramStateRef State, const CallEvent &Call,
   if (!CE)
     return;
 
-  const auto LinePtr =
-      getPointeeVal(Call.getArgSVal(0), State)->getAs<DefinedSVal>();
-  const auto Size =
-      getPointeeVal(Call.getArgSVal(1), State)->getAs<DefinedSVal>();
-  if (!LinePtr || !Size || !LinePtr->getAsRegion())
+  const auto LinePtrOpt = getPointeeVal(Call.getArgSVal(0), State);
+  const auto SizeOpt = getPointeeVal(Call.getArgSVal(1), State);
+  if (!LinePtrOpt || !SizeOpt || LinePtrOpt->isUnknownOrUndef() ||
+      SizeOpt->isUnknownOrUndef())
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steakhal wrote:

What makes sure that we have at least 2 arguments?

https://github.com/llvm/llvm-project/pull/145229