linux-kernel - [PATCHv4 2/3]posix_acl: Add the acl pointer check

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Message-ID: <b3657a100912281536s7a2ce33en2cae43889b99bfae@mail.gmail.com>
Date:	Tue, 29 Dec 2009 07:36:25 +0800
From:	liu weni <qingshenlwy@...il.com>
To:	viro <viro@...iv.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: [PATCHv4 2/3]posix_acl: Add the acl pointer check

Add two acl pointer checks before this function.

---

Signed-off-by: Liuwenyi <qingshenlwy@...il.com>
CC: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.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:
--
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