fix memory leak in memory views when copying overlapping contiguous slices

--HG--
extra : amend_source : 6c9be6e15396919e08090d9d12557c4255fd8a3c

CHANGES.rst

@@ -16,6 +16,8 @@ Features added
 Bugs fixed
 ----------
 
+* Memory leak in memory views when copying overlapping, contiguous slices.
+
 * Format checking when requesting non-contiguous buffers from
   ``cython.array`` objects was disabled in Py3.
 

Cython/Utility/MemoryView.pyx

@@ -1274,6 +1274,7 @@ cdef int memoryview_copy_contents({{memviewslice_name}} src,
             refcount_copying(&dst, dtype_is_object, ndim, False)
             memcpy(dst.data, src.data, slice_get_size(&src, ndim))
             refcount_copying(&dst, dtype_is_object, ndim, True)
+            free(tmpdata)
             return 0
 
     if order == 'F' == get_best_order(&dst, ndim):