fix ITS#4479

servers/slapd/limits.c

@@ -1287,6 +1287,9 @@ limits_check( Operation *op, SlapReply *rs )
 						return -1;
 					}
 					op->ors_slimit = slimit;
+
+				} else if ( slimit == 0 ) {
+					op->ors_slimit = 0;
 				}
 
 			} else {

tests/scripts/test025-limits

@@ -1359,6 +1359,52 @@ case $RC in
 	;;
 esac
 
+# ITS#4479
+PAGESIZE=1
+SIZELIMIT=2
+echo "Testing size limit request ($SIZELIMIT) for unlimited ID and pagesize=$PAGESIZE..."
+$LDAPRSEARCH -S "" -b "$BASEDN" -h $LOCALHOST -p $PORT1 -w secret -z $SIZELIMIT \
+	-D 'cn=Unlimited User,ou=People,dc=example,dc=com' \
+	-E '!pr='$PAGESIZE'/noprompt' '(objectClass=*)' > $SEARCHOUT 2>&1
+RC=$?
+COUNT=`awk '/^# numEntries:/ {print $3}' $SEARCHOUT`
+case $RC in
+	0)
+		if test x"$COUNT" != x ; then
+                        if test "$COUNT" -gt "$SIZELIMIT" ; then
+                                echo "...error: got $COUNT entries instead of the requested $SIZELIMIT"
+                                test $KILLSERVERS != no && kill -HUP $KILLPIDS
+                                exit 1
+                        fi
+                        echo "...didn't bump into the requested size limit ($SIZELIMIT; got $COUNT entries)"
+                else
+                        echo "...error: did not expect ldapsearch success ($RC)!"
+                        test $KILLSERVERS != no && kill -HUP $KILLPIDS
+                        exit 1
+                fi
+	;;
+	4)
+		if test x"$COUNT" != x ; then
+			if test $COUNT = $SIZELIMIT ; then
+				echo "...bumped into requested size limit ($SIZELIMIT)"
+			else
+				echo "...error: got $COUNT entries while requesting $SIZELIMIT..."
+                                test $KILLSERVERS != no && kill -HUP $KILLPIDS
+                                exit $RC
+                        fi
+		else
+			echo "...error: bumped into server-side size limit, but got no entries!"
+                        test $KILLSERVERS != no && kill -HUP $KILLPIDS
+                        exit $RC
+		fi
+	;;
+	*)
+		echo "ldapsearch failed ($RC)!"
+		test $KILLSERVERS != no && kill -HUP $KILLPIDS
+		exit $RC
+	;;
+esac
+
 test $KILLSERVERS != no && kill -HUP $KILLPIDS
 
 echo ">>>>> Test succeeded"