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 B8AC53BBC1; Mon, 2 Sep 2024 16:16:13 +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=1725293773; cv=none; b=nRO39AwilVeaIwT1Ap9Z2ZLJLryPDHlj8a4ZyIF/OMC0Mn4XJTPbrG2Y7MXv+1UnHiit4fQ+xJ7ltmZ4YtZWVR5p7CvggrguBwtUFMI6cPF193eaIlqVKKlxCSnAA2eGexSzq5ZK6jTVudgBRSqTEk/rtp/OUDMiTxXq8mqdDk4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725293773; c=relaxed/simple; bh=yP+DQzvw63ChFrvj3CjBpQFX8iR05V2bAnDs8DmZ0ng=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=mSW6O750B8l8JsCavY2Q7YFYl0GFFXgik4CtsMkzqDoRt5YC3k73WeEqHUFlSrTlawAHt/KfW/UbLE/GgoXYWzbGIjPBDBku+JWJvuRl9Vdkqv1ANqTzh7r2WZiOiafstWejRJqFcwN2NwDMeCTGoQW5xI7rV653AhhsR0CKOKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UvXw2XgR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UvXw2XgR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A990C4CEC2; Mon, 2 Sep 2024 16:16:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725293773; bh=yP+DQzvw63ChFrvj3CjBpQFX8iR05V2bAnDs8DmZ0ng=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=UvXw2XgRbUEkpGX21v00vwgbghwNg31bp//RynLl8Ojtu61grwn1ZWKVTOmaWUww7 1Orh24E/s62LK/GKaFMifKmGGbdUDH0Kiyc774IBOSWpQx28vE//M8iREmB1NXyKAY Fd5589smw6P1DwbbXFajJDpSMYemOb3L5IW6INpTOqFPr7UYkYxpBhKCpa7CHY/4Pi VYUbY0a+MjGOsGwwpDWxvd69YeXixkwVP0ypUKflf+axnMKMyAOeLB+0IJx5tAfiLM vNYca1mPdA0YCrbS10vsNf6lp6UTGbHq5RqJIuTcLnViCAOdu/+PFaoxjmmXbi0i6s 4awim7gc5a46Q== Message-ID: <329f65dd-a23b-460f-85ee-84fe674fe97d@kernel.org> Date: Mon, 2 Sep 2024 18:16:06 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9] usb: gadget: u_serial: Add null pointer check in gs_read_complete & gs_write_complete To: =?UTF-8?B?6IOh6L+e5Yuk?= , Michael Nazzareno Trimarchi , Prashanth K , "gregkh@linuxfoundation.org" Cc: "quic_jjohnson@quicinc.com" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "opensource.kernel" , "akpm@linux-foundation.org" References: From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 29/08/2024 13:54, 胡连勤 wrote: > From: Lianqin Hu > > Considering that in some extreme cases, when the unbind operation > is being executed, gserial_disconnect has already cleared gser->ioport, > triggering a gadget reconfiguration at this time and gs_read_complete > gets called afterwards, which results in accessing null pointer, > add a null pointer check to prevent this situation. > ... > > static void gs_write_complete(struct usb_ep *ep, struct usb_request *req) > { > - struct gs_port *port = ep->driver_data; > + struct gs_port *port; > + unsigned long flags; > + > + spin_lock_irqsave(&serial_port_lock, flags); > + port = ep->driver_data; > + > + if (!port) { > + spin_unlock_irqrestore(&serial_port_lock, flags); > + return; > + } > > spin_lock(&port->port_lock); > + spin_unlock(&serial_port_lock); You pinged us for this after 4 days. This is damn v9 and still unresolved comments from previous review. Explain, how did you resolve Greg's comment about this unintuitive code: https://lore.kernel.org/all/2024082251-grief-profanity-b0da@gregkh/ Pattern of immediacy, rush and impatience was used in one of latest big messes (just google about harassing open source maintainers by some random contributors). I suggest go back to drawing board and improve the code instead of making it spaghetti without explanation, even though we asked for that explanation. Best regards, Krzysztof