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The function efi_pecoff_debug_name() (called by efi_handle_name()) is used to extract a filename from the debug data directory entry located within a PE/COFF image. The name is copied into a temporary static buffer to allow for modifications, but the code currently erroneously modifies the original name within the loaded PE/COFF image. Fix by performing the modification on the copy in the temporary buffer, as originally intended. Signed-off-by: Michael Brown <mcb30@ipxe.org>