This is a note to let you know that I've just added the patch titled
ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal
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:
acpi-apei-add-missing-synchronize_rcu-on-notify_sci-removal.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 7d64f82cceb21e6d95db312d284f5f195e120154 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@xxxxxxx>
Date: Thu, 16 Mar 2017 14:30:39 +0000
Subject: ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal
From: James Morse <james.morse@xxxxxxx>
commit 7d64f82cceb21e6d95db312d284f5f195e120154 upstream.
When removing a GHES device notified by SCI, list_del_rcu() is used,
ghes_remove() should call synchronize_rcu() before it goes on to call
kfree(ghes), otherwise concurrent RCU readers may still hold this list
entry after it has been freed.
Signed-off-by: James Morse <james.morse@xxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Fixes: 81e88fdc432a (ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/apei/ghes.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1072,6 +1072,7 @@ static int ghes_remove(struct platform_d
if (list_empty(&ghes_sci))
unregister_acpi_hed_notifier(&ghes_notifier_sci);
mutex_unlock(&ghes_list_mutex);
+ synchronize_rcu();
break;
case ACPI_HEST_NOTIFY_NMI:
ghes_nmi_remove(ghes);
Patches currently in stable-queue which might be from james.morse@xxxxxxx are
queue-4.9/acpi-apei-add-missing-synchronize_rcu-on-notify_sci-removal.patch