From 75481cc3911866dbfb3ac0d3a1159b1c71d2e999 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 30 Sep 2020 10:59:12 +0200
Subject: Fix two (crash) bugs

- No device on cmdline
- No proper bounds check when reading pagefile clusters
---
 main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/main.c b/main.c
index dd2912b..a90fbaa 100644
--- a/main.c
+++ b/main.c
@@ -9,7 +9,7 @@
 #include <ntfs-3g/volume.h>
 #include <ntfs-3g/dir.h>
 
-#define PFMAX (10)
+#define PFMAX (100)
 static struct {
 	s64 from;
 	s64 to;
@@ -99,6 +99,9 @@ static int parse_options(int argc, char **argv)
 		}
 		if (help) break;
 	}
+	if (options.device == NULL) {
+		help = 1;
+	}
 
 	if (help || options.min_size < 0 || options.output_block_size < 1) {
 		ntfs_log_error("Usage: %s [-m|--min-size <bytes>] [-h|--human-readable] [-b|--brief] [-p|--pagefile] [-s|--block-size <bytes>] <device>\n", argv[0]);
@@ -412,7 +415,7 @@ static int get_pagefile_clusters(ntfs_volume *vol)
 		if (rec->non_resident) {
 			runs = ntfs_mapping_pairs_decompress(vol, rec, NULL);
 			if (runs) {
-				for (i = 0; runs[i].length > 0; i++) {
+				for (i = 0; pfcount < PFMAX && runs[i].length > 0; i++) {
 					pagefile[pfcount].from = runs[i].lcn;
 					pagefile[pfcount].to = runs[i].lcn + (runs[i].length - 1);
 					pfcount++;
-- 
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