From a6ec7d343b08328caf5681d7d0d0fc3ef3e253ef Mon Sep 17 00:00:00 2001
From: szaka <szaka>
Date: Mon, 5 May 2008 15:36:58 +0000
Subject: [PATCH] fix: multi-block allocation could allocate or free used
 blocks in certain rare circumstances. Because FUSE write(2) size was
 restricted to 4 KB until recently and the most widely used NTFS block size is
 also 4 KB thus allocations were typically single block size therefore the bug
 wasn't visible and couldn't be easily reproduced. However MFT allocations are
 multi-block size and they could lead to data corruption typically in close to
 full disk utilization.

---
 libntfs-3g/lcnalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libntfs-3g/lcnalloc.c b/libntfs-3g/lcnalloc.c
index 81d80cd5..88fb4730 100644
--- a/libntfs-3g/lcnalloc.c
+++ b/libntfs-3g/lcnalloc.c
@@ -278,7 +278,7 @@ runlist *ntfs_cluster_alloc(ntfs_volume *vol, VCN start_vcn, s64 count,
 		bmp_pos &= ~7;
 		writeback = 0;
 		
-		while (1) {
+		while (lcn < buf_size) {
 			byte = buf + (lcn >> 3);
 			bit = 1 << (lcn & 7);
 			if (has_guess) {