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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 08AFEC2D0DB for ; Fri, 27 Dec 2019 17:46:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D80AF206CB for ; Fri, 27 Dec 2019 17:46:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577468779; bh=bwX9MQGqz4h2Vatpd3JQoK5wQ8WUS1FdeURgY28UWGw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WPNdSxmeAVqO149p+ufdjZYaEb+OSg1My1TP3qUWGI4ZTWJIxiymWX2WM8FrHFAAa bMjY635JkOdiJA18nkRhM5vEDe6DGjuUE3uWe8Mw0uKM0yN1NK52AsRgW2VOP6mDGR pqs7emA9YkQMfzGhWZspdmKwR9/vNJQOisVwfJ+w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727579AbfL0RpP (ORCPT ); Fri, 27 Dec 2019 12:45:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:43750 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728703AbfL0RpN (ORCPT ); Fri, 27 Dec 2019 12:45:13 -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 DD23A24654; Fri, 27 Dec 2019 17:45:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577468712; bh=bwX9MQGqz4h2Vatpd3JQoK5wQ8WUS1FdeURgY28UWGw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QSr9nxVBHtnJOzceesMdsUS/TQ0TiHM4uymMPDyYT6U8YMUsp7WIfz10+aTKfxTD8 3QoLQEvcC2a8ZAW4Qy8vjuEkS4Lf1c7Del9NSfu5vnWL5g6Mr1JooOVqWRBr9KC131 q0gtkJzVeRNFuHeM6jLn1Kwv9GnaIRqcSs+s+mTA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ben Hutchings , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 67/84] net: qlogic: Fix error paths in ql_alloc_large_buffers() Date: Fri, 27 Dec 2019 12:43:35 -0500 Message-Id: <20191227174352.6264-67-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191227174352.6264-1-sashal@kernel.org> References: <20191227174352.6264-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Ben Hutchings [ Upstream commit cad46039e4c99812db067c8ac22a864960e7acc4 ] ql_alloc_large_buffers() has the usual RX buffer allocation loop where it allocates skbs and maps them for DMA. It also treats failure as a fatal error. There are (at least) three bugs in the error paths: 1. ql_free_large_buffers() assumes that the lrg_buf[] entry for the first buffer that couldn't be allocated will have .skb == NULL. But the qla_buf[] array is not zero-initialised. 2. ql_free_large_buffers() DMA-unmaps all skbs in lrg_buf[]. This is incorrect for the last allocated skb, if DMA mapping failed. 3. Commit 1acb8f2a7a9f ("net: qlogic: Fix memory leak in ql_alloc_large_buffers") added a direct call to dev_kfree_skb_any() after the skb is recorded in lrg_buf[], so ql_free_large_buffers() will double-free it. The bugs are somewhat inter-twined, so fix them all at once: * Clear each entry in qla_buf[] before attempting to allocate an skb for it. This goes half-way to fixing bug 1. * Set the .skb field only after the skb is DMA-mapped. This fixes the rest. Fixes: 1357bfcf7106 ("qla3xxx: Dynamically size the rx buffer queue ...") Fixes: 0f8ab89e825f ("qla3xxx: Check return code from pci_map_single() ...") Fixes: 1acb8f2a7a9f ("net: qlogic: Fix memory leak in ql_alloc_large_buffers") Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/qlogic/qla3xxx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c index 783ee6a32b5d..1b5e098b2367 100644 --- a/drivers/net/ethernet/qlogic/qla3xxx.c +++ b/drivers/net/ethernet/qlogic/qla3xxx.c @@ -2757,6 +2757,9 @@ static int ql_alloc_large_buffers(struct ql3_adapter *qdev) int err; for (i = 0; i < qdev->num_large_buffers; i++) { + lrg_buf_cb = &qdev->lrg_buf[i]; + memset(lrg_buf_cb, 0, sizeof(struct ql_rcv_buf_cb)); + skb = netdev_alloc_skb(qdev->ndev, qdev->lrg_buffer_len); if (unlikely(!skb)) { @@ -2767,11 +2770,7 @@ static int ql_alloc_large_buffers(struct ql3_adapter *qdev) ql_free_large_buffers(qdev); return -ENOMEM; } else { - - lrg_buf_cb = &qdev->lrg_buf[i]; - memset(lrg_buf_cb, 0, sizeof(struct ql_rcv_buf_cb)); lrg_buf_cb->index = i; - lrg_buf_cb->skb = skb; /* * We save some space to copy the ethhdr from first * buffer @@ -2793,6 +2792,7 @@ static int ql_alloc_large_buffers(struct ql3_adapter *qdev) return -ENOMEM; } + lrg_buf_cb->skb = skb; dma_unmap_addr_set(lrg_buf_cb, mapaddr, map); dma_unmap_len_set(lrg_buf_cb, maplen, qdev->lrg_buffer_len - -- 2.20.1