================
@@ -9896,9 +9903,13 @@ Expected<FileID> ASTImporter::Import(FileID FromID, bool 
IsBuiltin) {
         // FIXME: The filename may be a virtual name that does probably not
         // point to a valid file and we get no Entry here. In this case try 
with
         // the memory buffer below.
-        if (Entry)
+        if (Entry) {
+          if (isBufferSizeOverflow(ToSM, Entry->getSize()))
+            return llvm::make_error<ASTImportError>(
+                ASTImportError::UnsupportedConstruct);
----------------
danix800 wrote:

`ASTImportError::Unknown` would crash CTU module too, 
`ASTImportError::UnsupportedConstruct` might be deliberately chosen so the 
analysis could continue in this case.

https://github.com/llvm/llvm-project/pull/79084
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