CIFS: Do not set credits to 1 if the server didn't grant anything

commit 33fa5c8b8a7dbe6353a56eaa654b790348890d42 upstream.

Currently we reset the number of total credits granted by the server
to 1 if the server didn't grant us anything int the response. This
violates the SMB3 protocol - we need to trust the server and use
the credit values from the response. Fix this by removing the
corresponding code.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 333729c..a610381 100644 (file)
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -885,8 +885,6 @@ compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
        for (i = 0; i < num_rqst; i++)
                if (midQ[i]->resp_buf)
                        credits += ses->server->ops->get_credits(midQ[i]);
-       if (!credits)
-               credits = 1;
 
        for (i = 0; i < num_rqst; i++) {
                if (rc < 0)