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 X-Spam-Level: X-Spam-Status: No, score=-7.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FAKE_REPLY_C,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10728C47404 for ; Fri, 11 Oct 2019 11:17:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DDB0A21A4A for ; Fri, 11 Oct 2019 11:17:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hmEs5ubV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727581AbfJKLRh (ORCPT ); Fri, 11 Oct 2019 07:17:37 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:44458 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727226AbfJKLRh (ORCPT ); Fri, 11 Oct 2019 07:17:37 -0400 Received: by mail-pf1-f194.google.com with SMTP id q21so5886642pfn.11; Fri, 11 Oct 2019 04:17:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=VlmC3FzMBaeFdi8vKdtcQ+jsZk6Q6WwIVRbhfWm5BOY=; b=hmEs5ubVyP+9yFN5vhfrZRNiRHGIm/4+9CF0qg7KeaatHP681U9J2YkTTARsVVGmLH /LgKw8pGN1EhJggSGOPRQD20+b7RxlPK8kqokgmODoNJ+fk3KB81GItuVE8Z1jHNaVPd IjvYk0LsvlUx7KuNlXd+2AcFc+6QW9379pLGyYpWobN94jjnal3+vxAnKiPnfDfe5icw sO6k22ic/4fex3wCD9Cmax/JozcCKN1IG2jE7cJtMKbok0Xf2PRwsvmt9Xm2l1ZlYq4f NDgT8hPAbl/aajx10ahKrGqV3dcOzaCNkUfx4e7xi5NrZJR2ZAwCurCiilDj5n3PNaa7 zzCg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=VlmC3FzMBaeFdi8vKdtcQ+jsZk6Q6WwIVRbhfWm5BOY=; b=H54xXsAxGjnR4dtzj7L3XxSzO4wk8WnjYRiFFuq4yAZQNly6LikKzAetFZr9WzrgNv lPqzvETThFt4eBCAwQf23a4MVkYCxsSa+NP7ql1bP3/u3iw55X8EL/QUb3QhbX42QURT +SwZgX3xtlRD40VDR7LwuNis59vLQm4MKFwAVa2BVUiLTtGrqUMwLjJxsrx3Qg6mNFLW l0xCd6xrjtxRmK98zFOeKaaHbdMCzeeNA4UrqV2LomUyfEWuGCiqOhx8hdBiheBfgHT7 NJmaK/KAI6OfUYKob5yx3Y2qNKhkMQ5ZdicqrtMFW0Xrho8NyMSMDlJDuxcYDdRgP2Pr ap9w== X-Gm-Message-State: APjAAAVCDtd0trp9SB9sbFKOGCdbMIqa0pnGBTYBWWaBKTh+DBp5OyrY 1PHZ7GGx9ixodZmhV6dBC+9Utzel7pw= X-Google-Smtp-Source: APXvYqycn+7rVl7i80zdVMHgTMFIdpglnAHKiinGYoPqmz3pQhM0QUTxiW30A0mKr8IkfwBAaIX17w== X-Received: by 2002:a17:90a:730a:: with SMTP id m10mr17082622pjk.78.1570792656558; Fri, 11 Oct 2019 04:17:36 -0700 (PDT) Received: from localhost ([2402:3a80:139e:d60:aa0c:2692:c558:75f5]) by smtp.gmail.com with ESMTPSA id w14sm22001108pge.56.2019.10.11.04.17.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Oct 2019 04:17:36 -0700 (PDT) Date: Fri, 11 Oct 2019 16:47:32 +0530 From: Jas K To: syzbot+e7d46eb426883fb97efd@syzkaller.appspotmail.com Cc: stern@rowland.harvard.edu, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org Subject: Re: KMSAN: uninit-value in alauda_check_media Message-ID: <20191011111732.GA25982@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi, just taking a crack at this. Hope you guys don't mind. #syz test: https://github.com/google/kasan.git 1e76a3e5 diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c index ddab2cd3d2e7..bb309b9ad65b 100644 --- a/drivers/usb/storage/alauda.c +++ b/drivers/usb/storage/alauda.c @@ -452,7 +452,7 @@ static int alauda_init_media(struct us_data *us) static int alauda_check_media(struct us_data *us) { struct alauda_info *info = (struct alauda_info *) us->extra; - unsigned char status[2]; + unsigned char *status = us->iobuf; int rc; rc = alauda_get_media_status(us, status);