linux-kernel - Re: [PATCH v2] char: lp: Fix NULL pointer dereference of cad

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Message-ID: <2026012041-catfight-fetal-9347@gregkh>
Date: Tue, 20 Jan 2026 10:23:27 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Li Nan <linan666@...weicloud.com>
Cc: arnd@...db.de, linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	wanghai38@...wei.com
Subject: Re: [PATCH v2] char: lp: Fix NULL pointer dereference of cad

On Tue, Jan 20, 2026 at 03:55:47PM +0800, Li Nan wrote:
> > And how was this tested?
> 
> We found this issue during fuzzing in QEMU.
> Based on the root cause, I got the following reproducer:

QEMU is not real hardware :)

Do you really still use parallel port hardware in the real world?  or
is this just an accidemic exercise of a fuzzing tool?

thanks,

greg k-h