Patch "Drivers: hv: vmbus: Fix a bug in the error path in vmbus_open()" has been added to the 4.0-stable tree

Patch "Drivers: hv: vmbus: Fix a bug in the error path in vmbus_open()" has been added to the 4.0-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Drivers: hv: vmbus: Fix a bug in the error path in vmbus_open()

to the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drivers-hv-vmbus-fix-a-bug-in-the-error-path-in-vmbus_open.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 40384e4bbeb9f2651fe9bffc0062d9f31ef625bf Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: Fri, 27 Feb 2015 11:26:04 -0800
Subject: Drivers: hv: vmbus: Fix a bug in the error path in vmbus_open()

From: "K. Y. Srinivasan" <kys@microsoft.com>

commit 40384e4bbeb9f2651fe9bffc0062d9f31ef625bf upstream.

Correctly rollback state if the failure occurs after we have handed over
the ownership of the buffer to the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hv/channel.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -135,7 +135,7 @@ int vmbus_open(struct vmbus_channel *new
 			   GFP_KERNEL);
 	if (!open_info) {
 		err = -ENOMEM;
-		goto error0;
+		goto error_gpadl;
 	}
 
 	init_completion(&open_info->waitevent);
@@ -151,7 +151,7 @@ int vmbus_open(struct vmbus_channel *new
 
 	if (userdatalen > MAX_USER_DEFINED_BYTES) {
 		err = -EINVAL;
-		goto error0;
+		goto error_gpadl;
 	}
 
 	if (userdatalen)
@@ -195,6 +195,9 @@ error1:
 	list_del(&open_info->msglistentry);
 	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 
+error_gpadl:
+	vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);
+
 error0:
 	free_pages((unsigned long)out,
 		get_order(send_ringbuffer_size + recv_ringbuffer_size));


Patches currently in stable-queue which might be from kys@microsoft.com are

queue-4.0/drivers-hv-vmbus-fix-a-bug-in-the-error-path-in-vmbus_open.patch
queue-4.0/scsi-storvsc-fix-a-bug-in-copy_from_bounce_buffer.patch