linux-kernel - [PATCH 3.14 27/33] fs: NULL dereference in posix_acl_to

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Date:	Thu, 24 Apr 2014 14:48:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 3.14 27/33] fs: NULL dereference in posix_acl_to_xattr()

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 47ba9734403770a4c5e685b01f0a72b835dd4fff upstream.

This patch moves the dereference of "buffer" after the check for NULL.
The only place which passes a NULL parameter is gfs2_set_acl().

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/posix_acl.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -723,7 +723,7 @@ posix_acl_to_xattr(struct user_namespace
 		   void *buffer, size_t size)
 {
 	posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer;
-	posix_acl_xattr_entry *ext_entry = ext_acl->a_entries;
+	posix_acl_xattr_entry *ext_entry;
 	int real_size, n;
 
 	real_size = posix_acl_xattr_size(acl->a_count);
@@ -731,7 +731,8 @@ posix_acl_to_xattr(struct user_namespace
 		return real_size;
 	if (real_size > size)
 		return -ERANGE;
-	
+
+	ext_entry = ext_acl->a_entries;
 	ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
 
 	for (n=0; n < acl->a_count; n++, ext_entry++) {


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