Issue #23099: Closing io.BytesIO with exported buffer is rejected now to

prevent corrupting exported buffer.

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 36146449375..98b87f74824 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -852,8 +852,14 @@ class BytesIO(BufferedIOBase):
     def getbuffer(self):
         """Return a readable and writable view of the buffer.
         """
+        if self.closed:
+            raise ValueError("getbuffer on closed file")
         return memoryview(self._buffer)
 
+    def close(self):
+        self._buffer.clear()
+        super().close()
+
     def read(self, size=None):
         if self.closed:
             raise ValueError("read from closed file")