This is a note to let you know that I've just added the patch titled
Drivers: hv: vmbus: Don't leak memory when a channel is rescinded
to the 4.9-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drivers-hv-vmbus-don-t-leak-memory-when-a-channel-is-rescinded.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5e030d5ce9d99a899b648413139ff65bab12b038 Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Sun, 12 Mar 2017 20:00:30 -0700
Subject: Drivers: hv: vmbus: Don't leak memory when a channel is rescinded
From: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
commit 5e030d5ce9d99a899b648413139ff65bab12b038 upstream.
When we close a channel that has been rescinded, we will leak memory since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@xxxxxxxxxxxxx>
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/channel.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -506,12 +506,15 @@ int vmbus_teardown_gpadl(struct vmbus_ch
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+ * If the channel has been rescinded;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);
Patches currently in stable-queue which might be from kys@xxxxxxxxxxxxx are
queue-4.9/drivers-hv-vmbus-don-t-leak-memory-when-a-channel-is-rescinded.patch
queue-4.9/drivers-hv-vmbus-don-t-leak-channel-ids.patch