linux-kernel - [ 56/76] fs: prevent use after free in auditing when symlink following was denied

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Message-Id: <20121019024359.134989256@linuxfoundation.org>
Date:	Thu, 18 Oct 2012 19:47:20 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Sasha Levin <sasha.levin@...cle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Dave Jones <davej@...hat.com>
Subject: [ 56/76] fs: prevent use after free in auditing when symlink following was denied

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sasha Levin <sasha.levin@...cle.com>

commit ffd8d101a3a7d3f2e79deee1e342801703b6dc70 upstream.

Commit "fs: add link restriction audit reporting" has added auditing of failed
attempts to follow symlinks. Unfortunately, the auditing was being done after
the struct path structure was released earlier.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Cc: Dave Jones <davej@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/namei.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/namei.c
+++ b/fs/namei.c
@@ -692,9 +692,9 @@ static inline int may_follow_link(struct
 	if (parent->i_uid == inode->i_uid)
 		return 0;
 
+	audit_log_link_denied("follow_link", link);
 	path_put_conditional(link, nd);
 	path_put(&nd->path);
-	audit_log_link_denied("follow_link", link);
 	return -EACCES;
 }
 


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