[{"id":3675455,"web_url":"http://patchwork.ozlabs.org/comment/3675455/","msgid":"<465o88s0-2241-810o-0r60-34o7r2qqror0@xreary.bet>","list_archive_url":null,"date":"2026-04-09T18:33:41","subject":"Re: [PATCH v2] HID: mcp2221: validate report size in raw_event\n handler","submitter":{"id":67576,"url":"http://patchwork.ozlabs.org/api/people/67576/","name":"Jiri Kosina","email":"jikos@kernel.org"},"content":"On Tue, 24 Mar 2026, Sebastian Josue Alba Vives wrote:\n\n> MCP2221 devices use 64-byte HID reports. \n> Add a check at the top of the handler to reject any report shorter than \n> expected, and log a warning to aid debugging.\n\nSimilarly to ft260 -- where is the claim that the device can't send \nshorter reports coming from, please?\n\nThanks,","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-i2c@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=ZopG6yEw;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-i2c+bounces-17012-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"ZopG6yEw\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"Received":["from tor.lore.kernel.org (tor.lore.kernel.org\n [IPv6:2600:3c04:e001:36c::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fs7qj17NNz1xy1\n\tfor ; Fri, 10 Apr 2026 04:33:53 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby tor.lore.kernel.org (Postfix) with ESMTP id 4A73B3011A4C\n\tfor ; Thu, 9 Apr 2026 18:33:48 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 0383430F92E;\n\tThu, 9 Apr 2026 18:33:45 +0000 (UTC)","from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 96C909443;\n\tThu, 9 Apr 2026 18:33:44 +0000 (UTC)","by smtp.kernel.org (Postfix) with ESMTPSA id D14E2C4CEF7;\n\tThu, 9 Apr 2026 18:33:43 +0000 (UTC)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775759624; cv=none;\n b=MKzmhk5Udro6JtLgSHSz462U3PS26RrlgxyrbG13sMuchKL2YoiZiUDN3o4SvA4aTBnH0Bn+4nqj7grfjrpxq5A0PiIMgdLbCoeUT39m1rGkCq9AWFzkrroJxf85CiFJv0ZBPLnmroVyPfQm1rsOtwWexFTenlqB1mCv9Yih+fk=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775759624; c=relaxed/simple;\n\tbh=VKrAtMk/rBKFIyq1PebyO4kZsd6r9RHsUyaniD1TvlU=;\n\th=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:\n\t MIME-Version:Content-Type;\n b=Hnyh0u7FvIi5NvTt9/9KvPvltSktUt6NuRgUDWAYAqKq/TAs7ZC3+C1sUtC9blK8SH0sifxGPDYADc7ik/AtcmSbgj8s3MvX8Y7FlUWAEeVPV7dtHMZcN1KkQCcnMnlsoTDVOf75zNpio7XdI+WKZnVjfE641Uvsob332SDTAtY=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=ZopG6yEw; arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775759624;\n\tbh=VKrAtMk/rBKFIyq1PebyO4kZsd6r9RHsUyaniD1TvlU=;\n\th=Date:From:To:cc:Subject:In-Reply-To:References:From;\n\tb=ZopG6yEwEbzJP46334Y4yTvl1fonBxQLtY0Q8i9VfDTXfdHzp6yMVmEXq3v2/Sg6a\n\t NWzs7VcpE47P0GuH9NAKCO7d/YrH/R/+VZHX3OZhTAmObgSzfxWRv0vnQImdgmS6Rb\n\t eMxg4Yn6dG8loDLArrt9kbOcwFMalO4kFkLDWJ6a3tqQxgjn/maMXXsCu/Wrnb9mfK\n\t Hw++OJUvGdNARvW8wsKmqsrW4IjMEt9jMW2+VxKACOj9h/pK08K/Ss/oyOmZAOO7FH\n\t 88DJEz6srRoM5dMkwtADqmCnm5vgNg2Dpd2vFRuDrn460v11DHzlD5VH91hdtVgLPQ\n\t +fZm5dUbzgAig==","Date":"Thu, 9 Apr 2026 20:33:41 +0200 (CEST)","From":"Jiri Kosina ","To":"Sebastian Josue Alba Vives ","cc":"gupt21@gmail.com, bentiss@kernel.org, linux-i2c@vger.kernel.org,\n linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,\n stable@vger.kernel.org","Subject":"Re: [PATCH v2] HID: mcp2221: validate report size in raw_event\n handler","In-Reply-To":"<20260324170606.5407-1-sebasjosue84@gmail.com>","Message-ID":"<465o88s0-2241-810o-0r60-34o7r2qqror0@xreary.bet>","References":"<20260324062403.341855-1-sebasjosue84@gmail.com>\n <20260324170606.5407-1-sebasjosue84@gmail.com>","Precedence":"bulk","X-Mailing-List":"linux-i2c@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=US-ASCII"}}]