linux-kernel - Re: 回复: drivers/char: suspected null-pointer dereference problem in handle_control

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Message-ID: <dcd5178f3706fd57352f171bb20535ed052d26fe.camel@infradead.org>
Date:   Thu, 28 Oct 2021 13:54:49 +0200
From:   Amit Shah <amit@...radead.org>
To:     YE Chengfeng <cyeaa@...nect.ust.hk>,
        "amit@...nel.org" <amit@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 回复: drivers/char: suspected
 null-pointer dereference problem in handle_control_message

On Tue, 2021-10-26 at 11:51 +0000, YE Chengfeng wrote:
> Thanks for your reply.
> 
> Agree with you, seems that the branch at #line 1573 already handles this situation.
> 
> Another question, is it possible that port->name is null when show_port_name is invoked? I don't see any null-check there, could it be a null-dereference problem at #line 1282? Link is below.
> https://github.com/torvalds/linux/blob/master/drivers/char/virtio_console.c#L1282

Why don't you try it?

It's certainly possible that a port doesn't have a name.