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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 F0D82C43381 for ; Thu, 28 Feb 2019 15:23:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BCEF82171F for ; Thu, 28 Feb 2019 15:23:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551367420; bh=l6ycuajtL3zwudttFmo+p2mRC//c0Kybrpo7W0vWnqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=181i94sDi9Kj7KMfIX8Xa/9rP2YmHfoMaOw4TQQ262uDH7XmxLSS1sZ+S5jXshTxT NSfK/SNrYGtbcrGUJPQmrc9uVqwbcNC5FY6fXAPEl6et46++D2IY2ozIM095AHuPWR lY52WuImWYAzQTAs6TS3F+q2YRLuqyDnYrhrPdXw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388867AbfB1PXj (ORCPT ); Thu, 28 Feb 2019 10:23:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:46712 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388343AbfB1PNB (ORCPT ); Thu, 28 Feb 2019 10:13:01 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2752C218C3; Thu, 28 Feb 2019 15:13:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551366780; bh=l6ycuajtL3zwudttFmo+p2mRC//c0Kybrpo7W0vWnqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h24IeS/RmGgvd46Tgbu6zjiGtzz7JxxMLPZLy12LzjGye7HKLh2P37sOA06RHmady APmK/DnFzH1e8+u0ptCTWnbYVbG/RGejsHx1oyIImDhudHFcpSurNZbSVo91enRgxU BXBPpy5I7YWZsczaSXK9kSrrZbchEr9i6nhPbGd0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Julian Wiedmann , "David S . Miller" , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 49/64] s390/qeth: fix use-after-free in error path Date: Thu, 28 Feb 2019 10:10:50 -0500 Message-Id: <20190228151105.11277-49-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190228151105.11277-1-sashal@kernel.org> References: <20190228151105.11277-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Julian Wiedmann [ Upstream commit afa0c5904ba16d59b0454f7ee4c807dae350f432 ] The error path in qeth_alloc_qdio_buffers() that takes care of cleaning up the Output Queues is buggy. It first frees the queue, but then calls qeth_clear_outq_buffers() with that very queue struct. Make the call to qeth_clear_outq_buffers() part of the free action (in the correct order), and while at it fix the naming of the helper. Fixes: 0da9581ddb0f ("qeth: exploit asynchronous delivery of storage blocks") Signed-off-by: Julian Wiedmann Reviewed-by: Alexandra Winter Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/s390/net/qeth_core_main.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 4b3b9c4e46d2a..56aacf32f71b0 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -2454,11 +2454,12 @@ static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *q, int bidx) return 0; } -static void qeth_free_qdio_out_buf(struct qeth_qdio_out_q *q) +static void qeth_free_output_queue(struct qeth_qdio_out_q *q) { if (!q) return; + qeth_clear_outq_buffers(q, 1); qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q); kfree(q); } @@ -2532,10 +2533,8 @@ static int qeth_alloc_qdio_buffers(struct qeth_card *card) card->qdio.out_qs[i]->bufs[j] = NULL; } out_freeoutq: - while (i > 0) { - qeth_free_qdio_out_buf(card->qdio.out_qs[--i]); - qeth_clear_outq_buffers(card->qdio.out_qs[i], 1); - } + while (i > 0) + qeth_free_output_queue(card->qdio.out_qs[--i]); kfree(card->qdio.out_qs); card->qdio.out_qs = NULL; out_freepool: @@ -2568,10 +2567,8 @@ static void qeth_free_qdio_buffers(struct qeth_card *card) qeth_free_buffer_pool(card); /* free outbound qdio_qs */ if (card->qdio.out_qs) { - for (i = 0; i < card->qdio.no_out_queues; ++i) { - qeth_clear_outq_buffers(card->qdio.out_qs[i], 1); - qeth_free_qdio_out_buf(card->qdio.out_qs[i]); - } + for (i = 0; i < card->qdio.no_out_queues; i++) + qeth_free_output_queue(card->qdio.out_qs[i]); kfree(card->qdio.out_qs); card->qdio.out_qs = NULL; } -- 2.19.1