From 89e2149fdbd22db4c354df58f2939b8878e6f10d Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli@googlemail.com>
Date: Thu, 12 Jul 2012 08:46:54 +0200
Subject: [PATCH] isofs: avoid info leak on export

commit fe685aabf7c8c9f138e5ea900954d295bf229175 upstream.

For type 1 the parent_offset member in struct isofs_fid gets copied
uninitialized to userland. Fix this by initializing it to 0.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/isofs/export.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index 516eb21895c6..fd88add6ca46 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -135,6 +135,7 @@ isofs_export_encode_fh(struct dentry *dentry,
 	len = 3;
 	fh32[0] = ei->i_iget5_block;
  	fh16[2] = (__u16)ei->i_iget5_offset;  /* fh16 [sic] */
+	fh16[3] = 0;  /* avoid leaking uninitialized data */
 	fh32[2] = inode->i_generation;
 	if (connectable && !S_ISDIR(inode->i_mode)) {
 		struct inode *parent;
-- 
2.39.5