linux-kernel - [PATCH 3.16.y-ckt 113/144] cifs: smb2_clone_range()

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Date:	Tue, 21 Apr 2015 16:31:38 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sachin Prabhu <sprabhu@...hat.com>,
	Steve French <steve.french@...marydata.com>,
	Steve French <smfrench@...il.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 113/144] cifs: smb2_clone_range() - exit on unhandled error

3.16.7-ckt10 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit 2477bc58d49edb1c0baf59df7dc093dce682af2b upstream.

While attempting to clone a file on a samba server, we receive a
STATUS_INVALID_DEVICE_REQUEST. This is mapped to -EOPNOTSUPP which
isn't handled in smb2_clone_range(). We end up looping in the while loop
making same call to the samba server over and over again.

The proposed fix is to exit and return the error value when encountered
with an unhandled error.

Signed-off-by: Sachin Prabhu <sprabhu@...hat.com>
Signed-off-by: Steve French <steve.french@...marydata.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/cifs/smb2ops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index f325c59e12e6..772ee0ecf32a 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -630,7 +630,8 @@ smb2_clone_range(const unsigned int xid,
 
 			/* No need to change MaxChunks since already set to 1 */
 			chunk_sizes_updated = true;
-		}
+		} else
+			goto cchunk_out;
 	}
 
 cchunk_out:
--
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