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-rw-r--r--Modules/_io/fileio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 1aa5ee9..141b6de 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -583,6 +583,8 @@ fileio_readall(fileio *self)
Py_ssize_t total = 0;
int n;
+ if (self->fd < 0)
+ return err_closed();
if (!_PyVerify_fd(self->fd))
return PyErr_SetFromErrno(PyExc_IOError);