--- a/squashfs-tools/pseudo.c	2017-08-28 11:34:58.000000000 +0800
+++ b/squashfs-tools/pseudo.c	2017-09-30 15:52:52.000000000 +0800
@@ -336,6 +336,12 @@
	long long uid, gid;
	struct pseudo_dev *dev;

+	unsigned count = 0;
+	unsigned increment = 0;
+	unsigned start = 0;
+	unsigned i;
+	char filename_inc[2048];
+
	n = sscanf(def, "%s %c %o %s %s %n", filename, &type, &mode, suid,
			sgid, &bytes);

@@ -348,7 +354,8 @@
	switch(type) {
	case 'b':
	case 'c':
-		n = sscanf(def + bytes,  "%u %u", &major, &minor);
+		n = sscanf(def + bytes,  "%u %u %u %u %u", &major,
+					&minor, &start, &increment, &count);

		if(n < 2) {
			ERROR("Not enough or invalid arguments in pseudo file "
@@ -366,6 +373,11 @@
			goto error;
		}

+		if((unsigned)(start | count | increment) > 255) {
+			ERROR("start/count/increment out of range\n");
+			goto error;
+		}
+
	case 'f':
		if(def[bytes] == '\0') {
			ERROR("Not enough arguments in pseudo file "
@@ -459,7 +471,14 @@
		add_pseudo_file(dev);
	}

-	*pseudo = add_pseudo(*pseudo, dev, filename, filename);
+	if (count)
+		count--;
+
+	for (i = start; i <= start + count; i++) {
+		sprintf(filename_inc, count ? "%s%u" : "%s", filename, i);
+		dev->minor =  minor + (i - start) * increment;
+		*pseudo = add_pseudo(*pseudo, dev, filename_inc, filename_inc);
+	}

	return TRUE;