From: Long Li <longli@microsoft.com>
Date: Tue, 17 Apr 2018 12:17:05 -0700
Subject: [PATCH] cifs: smbd: Check for iov length on sending the last iov
Git-commit: ab60ee7bf9a84954f50a66a3d835860e80f99b7f
Patch-mainline: v4.17-rc2
References: bsc#1144333

When sending the last iov that breaks into smaller buffers to fit the
transfer size, it's necessary to check if this is the last iov.

If this is the latest iov, stop and proceed to send pages.

Signed-off-by: Long Li <longli@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
 fs/cifs/smbdirect.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 5008af546dd1..d611ed0537fd 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -2194,6 +2194,8 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
 						goto done;
 				}
 				i++;
+				if (i == rqst->rq_nvec)
+					break;
 			}
 			start = i;
 			buflen = 0;
-- 
2.16.4