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Date: Wed, 1 Nov 2017 22:26:48 +0100 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, linux@...ck-us.net Cc: James Morse <james.morse@....com>, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 123/139] ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal From: James Morse <james.morse@....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@....com> Reviewed-by: "Huang, Ying" <ying.huang@...el.com> Fixes: 81e88fdc432a (ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Willy Tarreau <w@....eu> --- drivers/acpi/apei/ghes.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 070b843..8cff7ca 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -988,6 +988,7 @@ static int ghes_remove(struct platform_device *ghes_dev) 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: mutex_lock(&ghes_list_mutex); -- 2.8.0.rc2.1.gbe9624a
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