linux-kernel - [PATCH 5.6 122/254] PM: sleep: wakeup: Skip wakeup_source_sysfs

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Message-Id: <20200416131341.600717164@linuxfoundation.org>
Date:   Thu, 16 Apr 2020 15:23:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Neeraj Upadhyay <neeraju@...eaurora.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.6 122/254] PM: sleep: wakeup: Skip wakeup_source_sysfs_remove() if device is not there

From: Neeraj Upadhyay <neeraju@...eaurora.org>

commit 87de6594dc45dbf6819f3e0ef92f9331c5a9444c upstream.

Skip wakeup_source_sysfs_remove() to fix a NULL pinter dereference via
ws->dev, if the wakeup source is unregistered before registering the
wakeup class from device_add().

Fixes: 2ca3d1ecb8c4 ("PM / wakeup: Register wakeup class kobj after device is added")
Signed-off-by: Neeraj Upadhyay <neeraju@...eaurora.org>
Cc: 5.4+ <stable@...r.kernel.org> # 5.4+
[ rjw: Subject & changelog, white space ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/base/power/wakeup.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -241,7 +241,9 @@ void wakeup_source_unregister(struct wak
 {
 	if (ws) {
 		wakeup_source_remove(ws);
-		wakeup_source_sysfs_remove(ws);
+		if (ws->dev)
+			wakeup_source_sysfs_remove(ws);
+
 		wakeup_source_destroy(ws);
 	}
 }