From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD480C4167B for ; Thu, 2 Nov 2023 11:38:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229754AbjKBLip (ORCPT ); Thu, 2 Nov 2023 07:38:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229483AbjKBLin (ORCPT ); Thu, 2 Nov 2023 07:38:43 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE8C812D; Thu, 2 Nov 2023 04:38:37 -0700 (PDT) Received: from [192.168.0.43] (cpc141996-chfd3-2-0-cust928.12-3.cable.virginm.net [86.13.91.161]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2C5358C2; Thu, 2 Nov 2023 12:38:18 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1698925098; bh=BKkxfrMt2z8Yz/3WSeR+qLMDNs5Bq5bMX0zmjDDOi/s=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=V3oVFEgcaeYOVEjYod53Nlcy7Zs3sZG3ZqpEMp7oTQpieD1Iph//wQY3kflO6f+jL 3HFAu+qeyQZXuc1P0rSl8SXAQm0mtaF6zUBVVMlqF5KYJuHvrhN3eA+40pPdhuOlOr nvVpBio3ahJ4UJsFMpS9XYAc/sMKIJvhFQtmqIBo= Message-ID: <99a757d9-a17f-47dd-8a52-7994fc5d1e53@ideasonboard.com> Date: Thu, 2 Nov 2023 11:38:32 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 2/4] usb: gadget: uvc: Allocate uvc_requests one at a time Content-Language: en-US To: Avichal Rakesh Cc: etalvala@google.com, gregkh@linuxfoundation.org, jchowdhary@google.com, laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, m.grzeschik@pengutronix.de References: <73309396-3856-43a2-9a6f-81a40ed594db@google.com> <20231030202231.3263253-1-arakesh@google.com> <20231030202231.3263253-2-arakesh@google.com> <7d4c762a-9fe1-41ba-b394-cefa8fa70786@ideasonboard.com> From: Dan Scally Autocrypt: addr=dan.scally@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/11/2023 22:13, Avichal Rakesh wrote: > > On 11/1/23 04:06, Dan Scally wrote: >> Morning Avichal >> >> On 30/10/2023 20:22, Avichal Rakesh wrote: >>> Currently, the uvc gadget driver allocates all uvc_requests as one array >>> and deallocates them all when the video stream stops. This includes >>> de-allocating all the usb_requests associated with those uvc_requests. >>> This can lead to use-after-free issues if any of those de-allocated >>> usb_requests were still owned by the usb controller. >>> >>> This patch is 1 of 2 patches addressing the use-after-free issue. >>> Instead of bulk allocating all uvc_requests as an array, this patch >>> allocates uvc_requests one at a time, which should allows for similar >>> granularity when deallocating the uvc_requests. This patch has no >>> functional changes other than allocating each uvc_request separately, >>> and similarly freeing each of them separately. >>> >>> Link: https://lore.kernel.org/7cd81649-2795-45b6-8c10-b7df1055020d@google.com >>> Suggested-by: Michael Grzeschik >>> Reviewed-by: Michael Grzeschik >>> Tested-by: Michael Grzeschik >>> Signed-off-by: Avichal Rakesh >> >> Thanks for the update; this seems ok now: >> >> >> Reviewed-by: Daniel Scally > Awesome, thank you! I'll add the Reviewed-by in the next patchset > (assuming you have more review comments on patch 4/4 v10). Sorry yes - taking me a while to wrap my head around everything but I hope to be done shortly! > > Regards, > Avi. > >>> --- >>> v1 -> v2 : Rebased to ToT >>> v2 -> v3 : Fix email threading goof-up >>> v3 -> v4 : Address review comments & re-rebase to ToT >>> v4 -> v5 : Address more review comments. Add Reviewed-by & Tested-by. >>> v5 -> v6 : No change >>> v6 -> v7 : No change >>> v7 -> v8 : No change. Getting back in review queue >>> v8 -> v9 : Address review comments. >>> v9 -> v10: Address review comments; remove BUG_ON(&video->reqs); >>>             Rebase to ToT (usb-next) >>> >>>