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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 10311C2BB48 for ; Mon, 14 Dec 2020 17:39:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5F0320643 for ; Mon, 14 Dec 2020 17:39:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2502374AbgLNRjN (ORCPT ); Mon, 14 Dec 2020 12:39:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:47838 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2408598AbgLNRhU (ORCPT ); Mon, 14 Dec 2020 12:37:20 -0500 From: Greg Kroah-Hartman Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dany Madden , Lijun Pan , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.9 017/105] ibmvnic: avoid memset null scrq msgs Date: Mon, 14 Dec 2020 18:27:51 +0100 Message-Id: <20201214172556.101359881@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214172555.280929671@linuxfoundation.org> References: <20201214172555.280929671@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: Dany Madden [ Upstream commit 9281cf2d584083a450fd65fd27cc5f0e692f6e30 ] scrq->msgs could be NULL during device reset, causing Linux to crash. So, check before memset scrq->msgs. Fixes: c8b2ad0a4a901 ("ibmvnic: Sanitize entire SCRQ buffer on reset") Signed-off-by: Dany Madden Signed-off-by: Lijun Pan Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/ibm/ibmvnic.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 32fc0266d99b1..f892cb4a08f4e 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -2857,15 +2857,26 @@ static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter, { int rc; + if (!scrq) { + netdev_dbg(adapter->netdev, + "Invalid scrq reset. irq (%d) or msgs (%p).\n", + scrq->irq, scrq->msgs); + return -EINVAL; + } + if (scrq->irq) { free_irq(scrq->irq, scrq); irq_dispose_mapping(scrq->irq); scrq->irq = 0; } - - memset(scrq->msgs, 0, 4 * PAGE_SIZE); - atomic_set(&scrq->used, 0); - scrq->cur = 0; + if (scrq->msgs) { + memset(scrq->msgs, 0, 4 * PAGE_SIZE); + atomic_set(&scrq->used, 0); + scrq->cur = 0; + } else { + netdev_dbg(adapter->netdev, "Invalid scrq reset\n"); + return -EINVAL; + } rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token, 4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq); -- 2.27.0