linux-kernel - Re: [usb?] possible deadlock in chaoskey

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Message-ID: <tencent_BE79CA6D3C2FA56CF897FCEA4AED62CD6C0A@qq.com>
Date: Wed,  9 Oct 2024 16:36:49 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+5f1ce62e956b7b19610e@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [usb?] possible deadlock in chaoskey_open

delay get the chaoskey_list_lock, avoid to circular locking dependency

#syz test

diff --git a/drivers/usb/misc/chaoskey.c b/drivers/usb/misc/chaoskey.c
index e8b63df5f975..17e29c6e878b 100644
--- a/drivers/usb/misc/chaoskey.c
+++ b/drivers/usb/misc/chaoskey.c
@@ -232,10 +232,10 @@ static void chaoskey_disconnect(struct usb_interface *interface)
 	if (dev->hwrng_registered)
 		hwrng_unregister(&dev->hwrng);
 
-	mutex_lock(&chaoskey_list_lock);
 	usb_deregister_dev(interface, &chaoskey_class);
 
 	usb_set_intfdata(interface, NULL);
+	mutex_lock(&chaoskey_list_lock);
 	mutex_lock(&dev->lock);
 
 	dev->present = false;