[Linux-NTFS-Dev] disk_io.c ntfs_cluster_read/write off by one error patch

[Ian J. <ia...@da...>]

ntfs_cluster_read and ntfs_cluster_write prevent you from accessing
areas outside the volume, by checking the parameters against the
volume size.

However, they both have an off-by-one error which prevents accesses to
the last cluster.

Ian.

--- disk_io.c.wrongeq	2003-05-05 01:21:26.000000000 +0100
+++ disk_io.c	2003-05-05 01:21:32.000000000 +0100
@@ -330,7 +330,7 @@
 		errno = EINVAL;
 		return -1;
 	}
-	if (vol->nr_clusters <= lcn + count) {
+	if (vol->nr_clusters < lcn + count) {
 		errno = ESPIPE;
 		return -1;
 	}
@@ -363,7 +363,7 @@
 		errno = EINVAL;
 		return -1;
 	}
-	if (vol->nr_clusters <= lcn + count) {
+	if (vol->nr_clusters < lcn + count) {
 		errno = ESPIPE;
 		return -1;
 	}