From e8108a5e92b06e04f891b355fb164a9fc467dc91 Mon Sep 17 00:00:00 2001
From: consp <none@yourbusiness.com>
Date: Mon, 31 Jul 2023 22:04:25 +0200
Subject: [PATCH] Reduce descriptor size if remaining bytes is less than
 request size

---
 smb2pdu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/smb2pdu.c b/smb2pdu.c
index 591d899a4..e9749fc4b 100644
--- a/smb2pdu.c
+++ b/smb2pdu.c
@@ -6792,7 +6792,13 @@ static ssize_t smb2_read_rdma_channel(struct ksmbd_work *work,
 				      size_t length)
 {
 	int err;
+    struct smb2_buffer_desc_v1 *desc;
 
+    /* set descriptor lenght to nbytes if less than request size */
+    if (length < req->Length) {
+        desc = (struct smb2_buffer_desc_v1 *)((char *)req + le16_to_cpu(req->ReadChannelInfoOffset));
+        desc->length = cpu_to_le32(length);
+    }
 	err = ksmbd_conn_rdma_write(work->conn, data_buf, length,
 				    (struct smb2_buffer_desc_v1 *)
 				    ((char *)req + le16_to_cpu(req->ReadChannelInfoOffset)),