src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeUint8ClampedArray.java

*** 131,154 ****
              return setter;
          }
  
          private void setElem(final int index, final int elem) {
              try {
                  final byte clamped;
                  if ((elem & 0xffff_ff00) == 0) {
!                     clamped = (byte)elem;
                  } else {
!                     clamped = elem < 0 ? 0 : (byte)0xff;
                  }
                  nb.put(index, clamped);
              } catch (final IndexOutOfBoundsException e) {
-                 //swallow valid array indexes. it's ok.
-                 if (index < 0) {
                      throw new ClassCastException();
                  }
              }
-         }
  
          @Override
          public boolean isClamped() {
              return true;
          }
--- 131,153 ----
              return setter;
          }
  
          private void setElem(final int index, final int elem) {
              try {
+                 if (index < nb.limit()) {
                      final byte clamped;
                      if ((elem & 0xffff_ff00) == 0) {
!                         clamped = (byte) elem;
                      } else {
!                         clamped = elem < 0 ? 0 : (byte) 0xff;
                      }
                      nb.put(index, clamped);
+                 }
              } catch (final IndexOutOfBoundsException e) {
                  throw new ClassCastException();
              }
          }
  
          @Override
          public boolean isClamped() {
              return true;
          }