linux-kernel - Re: [PATCH] appletalk: Fix potential NULL pointer dereference in unregister_snap

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Date:   Wed, 13 Mar 2019 14:03:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yuehaibing@...wei.com
Cc:     joe@...ches.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] appletalk: Fix potential NULL pointer dereference in
 unregister_snap_client

From: Yue Haibing <yuehaibing@...wei.com>
Date: Tue, 12 Mar 2019 10:04:26 +0800

>  	timer_setup(&aarp_timer, aarp_expire_timeout, 0);
>  	aarp_timer.expires  = jiffies + sysctl_aarp_expiry_time;
>  	add_timer(&aarp_timer);
> -	register_netdevice_notifier(&aarp_notifier);
> +	rc = register_netdevice_notifier(&aarp_notifier);
> +	if (rc)
> +		unregister_snap_client(aarp_dl);
> +	return rc;

You've left the timer running in this error path.