From mboxrd@z Thu Jan  1 00:00:00 1970
From: liu weni <qingshenlwy@gmail.com>
Subject: Re: [PATCHv3 2/3]posix_acl: add the pointer check into fs/posix_acl.c
Date: Mon, 28 Dec 2009 23:01:27 +0800
Message-ID: <b3657a100912280701s7b1420bdkac8d3d90291639ae@mail.gmail.com>
References: <b3657a100912280659oda68e2o73527ec58b35075b@mail.gmail.com>
	 <b3657a100912280700h3e8fbb13iba7f0357feff36e3@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
To: linux-kernel <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	viro <viro@zeniv.linux.org.uk>
Return-path: <linux-kernel-owner+glk-linux-kernel-3=40m.gmane.org-S1752097AbZL1PBa@vger.kernel.org>
In-Reply-To: <b3657a100912280700h3e8fbb13iba7f0357feff36e3@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

Add two acl pointer checks before this function.

---

Signed-off-by: Liuwenyi <qingshenlwy@gmail.com>
CC: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 39df95a..0d2a7a2 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -150,6 +150,12 @@ posix_acl_equiv_mode(const struct posix_acl *acl,
mode_t *mode_p)
 	mode_t mode = 0;
 	int not_equiv = 0;

+	if (!acl)
+		return -EINVAL;
+
+	if (IS_ERR(acl))
+		return PTR_ERR(acl);
+
 	FOREACH_ACL_ENTRY(pa, acl, pe) {
 		switch (pa->e_tag) {
 			case ACL_USER_OBJ: