From: Mathias Krause <minipli@googlemail.com>
Date: Thu, 12 Jul 2012 06:46:54 +0000 (+0200)
Subject: isofs: avoid info leak on export
X-Git-Tag: v2.6.34.15~51
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ea27a8916dccec0b5854266febb09414c3de588;p=thirdparty%2Fkernel%2Fstable.git

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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---

diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index ed752cb384742..344aa606eecda 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -131,6 +131,7 @@ 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;