linux-kernel - [PATCH 3.16 119/125] nfs3_list_one_acl(): check get_acl() result with IS_ERR_OR

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Message-Id: <20140903220627.267301984@linuxfoundation.org>
Date:	Wed,  3 Sep 2014 15:07:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Andrey Utkin <andrey.krieger.utkin@...il.com>,
	Christoph Hellwig <hch@....de>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 3.16 119/125] nfs3_list_one_acl(): check get_acl() result with IS_ERR_OR_NULL

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrey Utkin <andrey.krieger.utkin@...il.com>

commit 7a9e75a185e6b3a3860e6a26fb6e88691fc2c9d9 upstream.

There was a check for result being not NULL. But get_acl() may return
NULL, or ERR_PTR, or actual pointer.
The purpose of the function where current change is done is to "list
ACLs only when they are available", so any error condition of get_acl()
mustn't be elevated, and returning 0 there is still valid.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=81111
Signed-off-by: Andrey Utkin <andrey.krieger.utkin@...il.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Fixes: 74adf83f5d77 (nfs: only show Posix ACLs in listxattr if actually...)
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/nfs3acl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -256,7 +256,7 @@ nfs3_list_one_acl(struct inode *inode, i
 	char *p = data + *result;
 
 	acl = get_acl(inode, type);
-	if (!acl)
+	if (IS_ERR_OR_NULL(acl))
 		return 0;
 
 	posix_acl_release(acl);


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