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-rw-r--r--Modules/_io/bufferedio.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 586e93f..ddd17a2 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -965,6 +965,7 @@ _buffered_readinto_generic(buffered *self, Py_buffer *buffer, char readinto1)
PyObject *res = NULL;
CHECK_INITIALIZED(self)
+ CHECK_CLOSED(self, "readinto of closed file")
n = Py_SAFE_DOWNCAST(READAHEAD(self), Py_off_t, Py_ssize_t);
if (n > 0) {