linux-kernel - Re: [PATCHv3 1/3]posix_acl: add the pointer check into fs/posix

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Date:	Mon, 28 Dec 2009 23:32:36 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	liu weni <qingshenlwy@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCHv3 1/3]posix_acl: add the pointer check into
	fs/posix_acl.c

On Mon, Dec 28, 2009 at 11:00:58PM +0800, liu weni wrote:
>If the acl pointer is NULL or have some error, the acl is invalid.
>The Macro of FOREACH_ACL_ENTRY will make some error.
>
>---
>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..45f8afa 100644
>--- a/fs/posix_acl.c
>+++ b/fs/posix_acl.c
>@@ -76,6 +76,12 @@ posix_acl_valid(const struct posix_acl *acl)
> 	unsigned int id = 0;  /* keep gcc happy */
> 	int needs_mask = 0;
>
>+	if (!acl)
>+		return -EINVAL;
>+
>+	if (IS_ERR)

Did you even do a compile test?
I don't think this line will work...


>+		return PTR_ERR(acl);
>+
> 	FOREACH_ACL_ENTRY(pa, acl, pe) {
> 		if (pa->e_perm & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE))
> 			return -EINVAL;
>--
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