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

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Date:	Tue, 29 Dec 2009 07:29:05 +0800
From:	liu weni <qingshenlwy@...il.com>
To:	Américo Wang <xiyou.wangcong@...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

Sorry. I forgot diff it again.

2009/12/28 Américo Wang <xiyou.wangcong@...il.com>:
> 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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>
> --
> Live like a child, think like the god.
>
>
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