linux-kernel - [PATCH 3.11 020/182] fs: NULL dereference in posix_acl_to

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Message-Id: <1398329507-5911-21-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 24 Apr 2014 09:49:05 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 020/182] fs: NULL dereference in posix_acl_to_xattr()

3.11.10.9 -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>
[ luis: backported to 3.11:
  - posix_acl_to_xattr() is defined in xattr_acl.c, not in posix_acl.c ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/xattr_acl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/xattr_acl.c b/fs/xattr_acl.c
index 9fbea87..cd1147c 100644
--- a/fs/xattr_acl.c
+++ b/fs/xattr_acl.c
@@ -146,7 +146,7 @@ posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
 		   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);
@@ -154,7 +154,8 @@ posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
 		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++) {
-- 
1.9.1

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