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 73F8FC433EF for ; Mon, 14 Mar 2022 11:56:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239896AbiCNL5R (ORCPT ); Mon, 14 Mar 2022 07:57:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239835AbiCNL45 (ORCPT ); Mon, 14 Mar 2022 07:56:57 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0CACEDF8F; Mon, 14 Mar 2022 04:55:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C426EB80DE3; Mon, 14 Mar 2022 11:55:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98DE1C340ED; Mon, 14 Mar 2022 11:55:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1647258943; bh=YMYnOjNNfhNjUlC61X8qNNM2OgJ0OqDWeEDZ4qw2yJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qjicIDP2evSBAD7a9eOVzznArgu3Mfq40MSfG0spC/ZfdFPxRjRKZvLetehzW6JTS hiLWY2jOiPBrumUME0wkTUgXcuo+mKoGhn7WyR1XGbO61/tNfnoXDNIoXsDuFFMh9e Wu5qkKbn92s6WbIeSei24iM8RRIinGtf3aZiJyLY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Skripkin , Krzysztof Kozlowski , Jakub Kicinski , Sasha Levin , syzbot+16bcb127fb73baeecb14@syzkaller.appspotmail.com Subject: [PATCH 5.4 14/43] NFC: port100: fix use-after-free in port100_send_complete Date: Mon, 14 Mar 2022 12:53:25 +0100 Message-Id: <20220314112734.818860137@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220314112734.415677317@linuxfoundation.org> References: <20220314112734.415677317@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pavel Skripkin [ Upstream commit f80cfe2f26581f188429c12bd937eb905ad3ac7b ] Syzbot reported UAF in port100_send_complete(). The root case is in missing usb_kill_urb() calls on error handling path of ->probe function. port100_send_complete() accesses devm allocated memory which will be freed on probe failure. We should kill this urbs before returning an error from probe function to prevent reported use-after-free Fail log: BUG: KASAN: use-after-free in port100_send_complete+0x16e/0x1a0 drivers/nfc/port100.c:935 Read of size 1 at addr ffff88801bb59540 by task ksoftirqd/2/26 ... Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 port100_send_complete+0x16e/0x1a0 drivers/nfc/port100.c:935 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1670 ... Allocated by task 1255: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524 alloc_dr drivers/base/devres.c:116 [inline] devm_kmalloc+0x96/0x1d0 drivers/base/devres.c:823 devm_kzalloc include/linux/device.h:209 [inline] port100_probe+0x8a/0x1320 drivers/nfc/port100.c:1502 Freed by task 1255: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0xff/0x140 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] __cache_free mm/slab.c:3437 [inline] kfree+0xf8/0x2b0 mm/slab.c:3794 release_nodes+0x112/0x1a0 drivers/base/devres.c:501 devres_release_all+0x114/0x190 drivers/base/devres.c:530 really_probe+0x626/0xcc0 drivers/base/dd.c:670 Reported-and-tested-by: syzbot+16bcb127fb73baeecb14@syzkaller.appspotmail.com Fixes: 0347a6ab300a ("NFC: port100: Commands mechanism implementation") Signed-off-by: Pavel Skripkin Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20220308185007.6987-1-paskripkin@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/nfc/port100.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c index 1caebefb25ff..2ae1474faede 100644 --- a/drivers/nfc/port100.c +++ b/drivers/nfc/port100.c @@ -1609,7 +1609,9 @@ static int port100_probe(struct usb_interface *interface, nfc_digital_free_device(dev->nfc_digital_dev); error: + usb_kill_urb(dev->in_urb); usb_free_urb(dev->in_urb); + usb_kill_urb(dev->out_urb); usb_free_urb(dev->out_urb); usb_put_dev(dev->udev); -- 2.34.1