From 71bec91ec426598cdf2509164e713675a32e1f5b Mon Sep 17 00:00:00 2001 From: James Morse Date: Thu, 16 Mar 2017 14:30:39 +0000 Subject: [PATCH] ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal 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 Reviewed-by: "Huang, Ying" Fixes: 81e88fdc432a (ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support) Signed-off-by: Rafael J. Wysocki Signed-off-by: Willy Tarreau --- 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 070b843c37ee..8cff7cae7331 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); -- 2.20.1