linux-kernel - [PATCH 4.20 13/57] CIFS: Do not set credits to 1 if the server didnt grant anything

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Date:   Tue, 15 Jan 2019 17:35:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Shilovsky <pshilov@...rosoft.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 4.20 13/57] CIFS: Do not set credits to 1 if the server didnt grant anything

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

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

From: Pavel Shilovsky <pshilov@...rosoft.com>

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@...rosoft.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/transport.c |    2 --
 1 file changed, 2 deletions(-)

--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -892,8 +892,6 @@ compound_send_recv(const unsigned int xi
 	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)