Bug#661527: Apparently a bug in libmount1

[Matthias Großmann <grossmms@googlemail.com>]

I think this is a bug in libmount1. The function mnt_chdir_to_parent() in
util-linux-2.20.1/libmount/src/utils.c fails to handle paths of the form 
/dir correctly. The following patch for the source package util-linux should 
fix this:

--- util-linux-2.20.1.orig/libmount/src/utils.c	2011-10-18 07:41:47.000000000 +0200
+++ util-linux-2.20.1/libmount/src/utils.c	2012-10-10 21:07:40.559854007 +0200
@@ -69,7 +69,7 @@
  */
 int mnt_chdir_to_parent(const char *target, char **filename)
 {
-	char *path, *last = NULL;
+	char *path, *path2, *last = NULL;
 	char cwd[PATH_MAX];
 	int rc = -EINVAL;
 
@@ -85,11 +85,14 @@
 		if (!last)
 			goto err;
 	}
-	if (!*path)
-		*path = '/';	/* root */
 
-	if (chdir(path) == -1) {
-		DBG(UTILS, mnt_debug("failed to chdir to %s: %m", path));
+	if (*path)
+		path2 = path;
+	else
+		path2 = "/";	/* root */
+
+	if (chdir(path2) == -1) {
+		DBG(UTILS, mnt_debug("failed to chdir to %s: %m", path2));
 		rc = -errno;
 		goto err;
 	}
@@ -98,12 +101,12 @@
 		rc = -errno;
 		goto err;
 	}
-	if (strcmp(cwd, path) != 0) {
-		DBG(UTILS, mnt_debug("path moved (%s -> %s)", path, cwd));
+	if (strcmp(cwd, path2) != 0) {
+		DBG(UTILS, mnt_debug("path moved (%s -> %s)", path2, cwd));
 		goto err;
 	}
 
-	DBG(CXT, mnt_debug("current directory moved to %s", path));
+	DBG(CXT, mnt_debug("current directory moved to %s", path2));
 
 	*filename = path;