linux-kernel - [ 51/59] Fix length of buffer copied in __nfs4_get_acl

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Date:	Wed, 11 Apr 2012 16:11:26 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Sachin Prabhu <sprabhu@...hat.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Josh Boyer <jwboyer@...hat.com>
Subject: [ 51/59] Fix length of buffer copied in __nfs4_get_acl_uncached

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

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

From: Sachin Prabhu <sprabhu@...hat.com>

commit 20e0fa98b751facf9a1101edaefbc19c82616a68 upstream.

_copy_from_pages() used to copy data from the temporary buffer to the
user passed buffer is passed the wrong size parameter when copying
data. res.acl_len contains both the bitmap and acl lenghts while
acl_len contains the acl length after adjusting for the bitmap size.

Signed-off-by: Sachin Prabhu <sprabhu@...hat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Cc: Josh Boyer <jwboyer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/nfs4proc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3618,7 +3618,7 @@ static ssize_t __nfs4_get_acl_uncached(s
 		if (acl_len > buflen)
 			goto out_free;
 		_copy_from_pages(buf, pages, res.acl_data_offset,
-				res.acl_len);
+				acl_len);
 	}
 	ret = acl_len;
 out_free:


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