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| author | James Morse <james.morse@arm.com> | 2017-03-16 17:30:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-30 11:21:56 +0300 |
| commit | 3bc8e4f96fe906c4a872f84c7d9cf053e5786bfe (patch) | |
| tree | 234c54e76d39a05a05896af860f08b8d3e80d40b | |
| parent | 454cac5d0891494dd2050a4da4fa64a9173c38af (diff) | |
| download | linux-3bc8e4f96fe906c4a872f84c7d9cf053e5786bfe.tar.xz | |
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 <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>
| -rw-r--r-- | drivers/acpi/apei/ghes.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index e53bef6cf53c..0375c6024062 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -1072,6 +1072,7 @@ 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: ghes_nmi_remove(ghes); |