Drivers: hv: vmbus: Don't leak memory when a channel is rescinded

When we close a channel that has been rescinded, we will leak memory since
vmbus_teardown_gpadl() returns an error. Fix this so that we can properly
cleanup the memory allocated to the ring buffers.

Fixes: ccb61f8a99e6 ("Drivers: hv: vmbus: Fix a rescind handling bug")

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

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 57b2958205c7..321b8833fa6f 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -502,12 +502,15 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
 
         wait_for_completion(&info->waitevent);
 
-        if (channel->rescind) {
-                ret = -ENODEV;
-                goto post_msg_err;
-        }
-
 post_msg_err:
+        /*
+         * If the channel has been rescinded;
+         * we will be awakened by the rescind
+         * handler; set the error code to zero so we don't leak memory.
+         */
+        if (channel->rescind)
+                ret = 0;
+
         spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
         list_del(&info->msglistentry);
         spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);