linux-kernel - [PATCH 4.18 062/145] Drivers: hv: vmbus: Fix the offer_in_progress in vmbus_process

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Message-Id: <20180907210909.679498645@linuxfoundation.org>
Date:   Fri,  7 Sep 2018 23:08:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 4.18 062/145] Drivers: hv: vmbus: Fix the offer_in_progress in vmbus_process_offer()

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

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

From: Dexuan Cui <decui@...rosoft.com>

commit 50229128727f7e11840ca1b2b501f880818d56b6 upstream.

I didn't really hit a real bug, but just happened to spot the bug:
we have decreased the counter at the beginning of vmbus_process_offer(),
so we mustn't decrease it again.

Fixes: 6f3d791f3006 ("Drivers: hv: vmbus: Fix rescind handling issues")
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
Cc: stable@...r.kernel.org
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Cc: K. Y. Srinivasan <kys@...rosoft.com>
Cc: Stable <stable@...r.kernel.org> # 4.14 and above
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hv/channel_mgmt.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -527,10 +527,8 @@ static void vmbus_process_offer(struct v
 		struct hv_device *dev
 			= newchannel->primary_channel->device_obj;

-		if (vmbus_add_channel_kobj(dev, newchannel)) {
-			atomic_dec(&vmbus_connection.offer_in_progress);
+		if (vmbus_add_channel_kobj(dev, newchannel))
 			goto err_free_chan;
-		}

 		if (channel->sc_creation_callback != NULL)
 			channel->sc_creation_callback(newchannel);