diff -Nru dpkg-1.17.5ubuntu5.5/debian/changelog dpkg-1.17.5ubuntu5.6/debian/changelog
--- dpkg-1.17.5ubuntu5.5/debian/changelog	2015-11-26 12:57:52.000000000 +0000
+++ dpkg-1.17.5ubuntu5.6/debian/changelog	2016-04-25 18:52:44.000000000 +0000
@@ -1,3 +1,9 @@
+dpkg (1.17.5ubuntu5.6) trusty; urgency=medium
+
+  * dpkg-maintscript-helper: s/exit/return/ in subshells (LP: #1574285)
+
+ -- Adam Conrad <adconrad@ubuntu.com>  Mon, 25 Apr 2016 12:44:01 -0600
+
 dpkg (1.17.5ubuntu5.5) trusty-security; urgency=medium
 
   * SECURITY UPDATE: multiple security issues
diff -Nru dpkg-1.17.5ubuntu5.5/scripts/dpkg-maintscript-helper.sh dpkg-1.17.5ubuntu5.6/scripts/dpkg-maintscript-helper.sh
--- dpkg-1.17.5ubuntu5.5/scripts/dpkg-maintscript-helper.sh	2013-12-12 07:00:28.000000000 +0000
+++ dpkg-1.17.5ubuntu5.6/scripts/dpkg-maintscript-helper.sh	2016-04-25 18:47:45.000000000 +0000
@@ -396,9 +396,9 @@
 		package="$1"
 		file="$2"
 		if ! dpkg-query -L "$package" | grep -q -x "$file"; then
-			return 1
+			exit 1
 		fi
-		return 0
+		exit 0
 	' check-files-ownership "$PACKAGE" || \
 		error "directory '$PATHNAME' contains files not owned by" \
 		      "package $PACKAGE, cannot switch to symlink"