[clang] [analyzer] Fix crash in Stream checker when using void pointers (PR #97199)

[Donát Nagy via cfe-commits]

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@@ -1034,16 +1034,16 @@ void StreamChecker::preWrite(const FnDescription *Desc, const CallEvent &Call,
   C.addTransition(State);
 }
 
-static std::optional<QualType> getPointeeType(const MemRegion *R) {
+static QualType getPointeeType(const MemRegion *R) {
   if (!R)
-    return std::nullopt;
+    return {};
   if (const auto *ER = dyn_cast<ElementRegion>(R))
-    return ER->getElementType();
+    return ER->getElementType()->getCanonicalTypeUnqualified();
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NagyDonat wrote:

Consider moving the `->getCanonicalTypeUnqualified()` calls into `escapeByStartIndexAndCount()` because that's the only place where it will be relevant. (This would eliminate the code duplication.)


https://github.com/llvm/llvm-project/pull/97199