From 93d2cb6c82f4d50a1b35b9de379ebb1d022801ac Mon Sep 17 00:00:00 2001
From: Long Li <longli@microsoft.com>
Date: Wed, 28 Jun 2017 15:55:55 -0700
Subject: [PATCH] cifs: Do not modify mid entry after submitting I/O in
 cifs_call_async
Git-commit: 93d2cb6c82f4d50a1b35b9de379ebb1d022801ac
Patch-mainline: v4.13-rc1
References: bsc#1051510, bsc#1144333

In cifs_call_async, server may respond as soon as I/O is submitted. Because
mid entry is freed on the return path, it should not be modified after I/O
is submitted.

cifs_save_when_sent modifies the sent timestamp in mid entry, and should not
be called after I/O. Call it before I/O.

Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
 fs/cifs/transport.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 47a125ece11e..7efbab013957 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -536,11 +536,14 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
 	list_add_tail(&mid->qhead, &server->pending_mid_q);
 	spin_unlock(&GlobalMid_Lock);
 
-
+	/*
+	 * Need to store the time in mid before calling I/O. For call_async,
+	 * I/O response may come back and free the mid entry on another thread.
+	 */
+	cifs_save_when_sent(mid);
 	cifs_in_send_inc(server);
 	rc = smb_send_rqst(server, rqst, flags);
 	cifs_in_send_dec(server);
-	cifs_save_when_sent(mid);
 
 	if (rc < 0) {
 		server->sequence_number -= 2;
-- 
2.16.4