From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx.swemel.ru (unknown [95.143.211.150]) (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 3FE453E51FC; Thu, 1 Oct 2026 10:44:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.143.211.150 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790851559; cv=none; b=ckQBTkFQhsD9Tu5yEIsUHuDbm/iqadiG+Q4iyyU0XILMUaqQx8JFj+7BFHB8SaMwZIPvPv4IfA5UaHMIrSRVXhWaVwm4wx6rT9x0L63CiHHts6oifs5/WAZBLMWg73dtvqdGTIu6NPBsq8kdS7tYi6bgMk5b9l2dO9bB28G9988= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790851559; c=relaxed/simple; bh=SaWjJYGUQ7c8OMKwCk0VdRzn2DP0wuxI578A85RVXjI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KMxtp7/N15Ac3waPE/4H30EIxF2Xc1J88TtIUESwEueMFfFHWcb6xM1MzGOyuqA3GC/aaEbLKzvvi9TIFB6pqRQun/EVlv7Z01ytdkZCPj5FKZbtvTweHXGzdkpob4ccK8UPC1tVXlL6F3/xCMF9dpj0UKT6lkymgk01RQ4DD8M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=swemel.ru; spf=unknown smtp.mailfrom=swemel.ru; arc=none smtp.client-ip=95.143.211.150 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=swemel.ru Authentication-Results: smtp.subspace.kernel.org; spf=tempfail smtp.mailfrom=swemel.ru From: Denis Arefev DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=swemel.ru; s=mail; t=1790851066; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ws6HwGRYvEC9/7mLPTRmtGGSscHu4/UF85e0oD/ZwUg=; b=XcoLnISB/1Aa+vGGAEYRoNxFcz6ICLWk8HLeHMEjY/TwxHMSNhgPlAbszi1YrR1oyJn6VZ 1rr7tvlMzYVMzIeQNU3bMqZDtRjCpLXMe0RMJGfLsXXPSiU8Lc3x5BPQwKbaz5J2xbDtiA CPpQLGGdE+23ez8HGlxur91d69V1GAo= To: syzbot@kernel.org Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, nogikh@google.com, stern@rowland.harvard.edu, syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com, wangjinchao600@gmail.com Subject: Re: [PATCH] usb: gadget: dummy_hcd: prevent unbind via sysfs Date: Thu, 1 Oct 2026 13:37:46 +0300 Message-ID: <20261001103746.11108-1-arefev@swemel.ru> In-Reply-To: <18ec3122-7566-49e5-9964-1028857405b1@mail.kernel.org> References: <18ec3122-7566-49e5-9964-1028857405b1@mail.kernel.org> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hello. I would like to gently ping regarding this patch. It addresses a clear null-pointer dereference vulnerability in the dummy_hcd driver reported by syzbot, which could potentially lead to a use-after-free race condition under certain scenarios. Disabling sysfs unbind attributes via `.suppress_bind_attrs = true` seems to be the most robust way to synchronize the lifecycles of dummy_hcd and dummy_udc. Are there any concerns or further changes required to get this patch accepted? Thank you for your time! Best regards, Denis Arefev