linux-kernel - [PATCH 11/29] fs: NULL dereference in posix_acl_to

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Message-Id: <1396343741-1524-12-git-send-email-swhiteho@redhat.com>
Date:	Tue,  1 Apr 2014 10:15:23 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	stable <stable@...r.kernel.org>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 11/29] fs: NULL dereference in posix_acl_to_xattr()

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

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

Cc: stable <stable@...r.kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 38bae5a..202b84f 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -717,7 +717,7 @@ 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);
@@ -725,7 +725,8 @@ 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++) {
-- 
1.8.3.1

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