From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 783253DA7ED for ; Tue, 20 Jan 2026 09:23:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768901010; cv=none; b=GbX6n/eRVkhAwyTMtT/6UO9swZd/70V97+esHANoAMTU6Iyh1QMJEvODH6IVvdngM+awKBMwINuMcA7fWeoq/qJ6vOotbVz+k6OMqv3LJshpu8qCsXeQ6dAOil0toa+U1uPDuagwKKHQHbci1Tz+itsoU2t9rPGvAJ/2WJwl/l4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768901010; c=relaxed/simple; bh=UcyYZ9l4c1ywspNT3tPwxnnEdUjiPoSwvRIPF0yT/X0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=g5HfGTihE7GlMlXGp89ezee/ONRMUTrtNpZlLxhH5RL4mA0JbOXcS2VckwEOcx+eDOsM2u4o5IPkcN2vZ8uRAWYUAddEXIEOUCsX3sscjfRhaQDQ4oh2W7oByqZB9Gs8v85GDcg6nQIc2Xohy8pB3e/iDymqbe70IfUgsELYt7U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2SG6DkMw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="2SG6DkMw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E05FC16AAE; Tue, 20 Jan 2026 09:23:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768901010; bh=UcyYZ9l4c1ywspNT3tPwxnnEdUjiPoSwvRIPF0yT/X0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=2SG6DkMwZeGjnEHKpyosIRnEB378r4AjlF0iGkWt7qMzTl35TZXkzbnCmOO0gDPYE xXcQAiGyW9bqLlfQ8le0IPrsFfP8KQBrxc74oxE1K+CZEZUuEAMgct2emRBi/C2Mi5 N+QeO3ZVDSquLt9q7wkLv98PIFqtYt1EHzpADE74= Date: Tue, 20 Jan 2026 10:23:27 +0100 From: Greg KH To: Li Nan Cc: arnd@arndb.de, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, wanghai38@huawei.com Subject: Re: [PATCH v2] char: lp: Fix NULL pointer dereference of cad Message-ID: <2026012041-catfight-fetal-9347@gregkh> References: <20260108024155.3800149-1-linan666@huaweicloud.com> <2026011644-glimpse-eatery-c556@gregkh> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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