Index: clang-tidy/modernize/UseAutoCheck.cpp
===================================================================
--- clang-tidy/modernize/UseAutoCheck.cpp
+++ clang-tidy/modernize/UseAutoCheck.cpp
@@ -222,6 +222,9 @@
              has(varDecl()),
              unless(has(varDecl(anyOf(
                  unless(hasInitializer(ignoringParenImpCasts(cxxNewExpr()))),
+                 // Skip declarations that are already using auto.
+                 anyOf(hasType(autoType()),
+                       hasType(pointerType(pointee(autoType())))),
                  // FIXME: TypeLoc information is not reliable where CV
                  // qualifiers are concerned so these types can't be
                  // handled for now.
Index: test/clang-tidy/modernize-use-auto-new.cpp
===================================================================
--- test/clang-tidy/modernize-use-auto-new.cpp
+++ test/clang-tidy/modernize-use-auto-new.cpp
@@ -95,4 +95,9 @@
     // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use auto when initializing with new
     // CHECK-FIXES: auto g = new int*, h = new int_p;
   }
+
+  // Don't warn when 'auto' is already being used.
+  auto aut = new MyType();
+  auto *paut = new MyType();
+  const auto *pcaut = new MyType();
 }