From: <gregkh@linuxfoundation.org>
To: james.morse@arm.com, gregkh@linuxfoundation.org,
rafael.j.wysocki@intel.com, ying.huang@intel.com
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal" has been added to the 4.4-stable tree
Date: Mon, 28 Aug 2017 09:18:14 +0200 [thread overview]
Message-ID: <1503904694182215@kroah.com> (raw)
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 4.4-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-4.4 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 7d64f82cceb21e6d95db312d284f5f195e120154 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
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@arm.com>
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@arm.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Fixes: 81e88fdc432a (ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/acpi/apei/ghes.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1067,6 +1067,7 @@ 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@arm.com are
queue-4.4/acpi-apei-add-missing-synchronize_rcu-on-notify_sci-removal.patch
reply other threads:[~2017-08-28 7:18 UTC|newest]
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