Prevent newline errors with Debian packages (#26332)

Fixes #26313

modules/packages/debian/metadata.go

 			value := strings.TrimSpace(parts[1])
 			switch key {
 			case "Package":
-				if !namePattern.MatchString(value) {
-					return nil, ErrInvalidName
-				}
 				p.Name = value
 			case "Version":
-				if !versionPattern.MatchString(value) {
-					return nil, ErrInvalidVersion
-				}
 				p.Version = value
 			case "Architecture":
-				if value == "" {
-					return nil, ErrInvalidArchitecture
-				}
 				p.Architecture = value
 			case "Maintainer":
 				a, err := mail.ParseAddress(value)
 		return nil, err
 	}
 
+	if !namePattern.MatchString(p.Name) {
+		return nil, ErrInvalidName
+	}
+	if !versionPattern.MatchString(p.Version) {
+		return nil, ErrInvalidVersion
+	}
+	if p.Architecture == "" {
+		return nil, ErrInvalidArchitecture
+	}
+
 	dependencies := strings.Split(depends.String(), ",")
 	for i := range dependencies {
 		dependencies[i] = strings.TrimSpace(dependencies[i])
 	}
 	p.Metadata.Dependencies = dependencies
 
-	p.Control = control.String()
+	p.Control = strings.TrimSpace(control.String())
 
 	return p, nil
 }

services/packages/debian/repository.go

 		}
 		addSeparator = true
 
-		fmt.Fprint(w, pfd.Properties.GetByName(debian_module.PropertyControl))
+		fmt.Fprintf(w, "%s\n", strings.TrimSpace(pfd.Properties.GetByName(debian_module.PropertyControl)))
 
 		fmt.Fprintf(w, "Filename: pool/%s/%s/%s\n", distribution, component, pfd.File.Name)
 		fmt.Fprintf(w, "Size: %d\n", pfd.Blob.Size)