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[Patch #708374] Only apply the check for file size if the file is a regular file, not a character or block device.
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@ -901,7 +901,8 @@ new_mmap_object(PyObject *self, PyObject *args, PyObject *kwdict)
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/* on OpenVMS we must ensure that all bytes are written to the file */
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fsync(fd);
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# endif
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if (fstat(fd, &st) == 0 && (size_t)map_size > st.st_size) {
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if (fstat(fd, &st) == 0 && S_ISREG(st.st_mode) &&
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(size_t)map_size > st.st_size) {
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PyErr_SetString(PyExc_ValueError,
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"mmap length is greater than file size");
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return NULL;
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