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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 EC79FC2BA19 for ; Mon, 15 Mar 2021 14:09:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADEA764EE9 for ; Mon, 15 Mar 2021 14:09:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234356AbhCOOJ2 (ORCPT ); Mon, 15 Mar 2021 10:09:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:34930 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232154AbhCON5w (ORCPT ); Mon, 15 Mar 2021 09:57:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1555364F41; Mon, 15 Mar 2021 13:57:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816672; bh=61hwE0aosy0oCTorMejB+6tfBdUSKc8uckX85DtWClM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zsVHfcXf+4Cx2237AuAVaT8gTAYqabcF1lEy4dCfJqpkchLFaZjMvbxBut+6Hv/jQ D5jghqHa9SPheMo3Dz5DKgqLuRwiktKKGc429Jyd07hjOi2f9Fuf8OUOS9i2GRttIp DlVj5AlpL3Sjo1Ju5rcCozCZFrV7xw4Uaw0dSskI= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Biao Huang , "David S. Miller" Subject: [PATCH 5.11 055/306] net: ethernet: mtk-star-emac: fix wrong unmap in RX handling Date: Mon, 15 Mar 2021 14:51:58 +0100 Message-Id: <20210315135509.511797491@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135507.611436477@linuxfoundation.org> References: <20210315135507.611436477@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: Greg Kroah-Hartman From: Biao Huang commit 95b39f07a17faef3a9b225248ba449b976e529c8 upstream. mtk_star_dma_unmap_rx() should unmap the dma_addr of old skb rather than that of new skb. Assign new_dma_addr to desc_data.dma_addr after all handling of old skb ends to avoid unexpected receive side error. Fixes: f96e9641e92b ("net: ethernet: mtk-star-emac: fix error path in RX handling") Signed-off-by: Biao Huang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/mediatek/mtk_star_emac.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/net/ethernet/mediatek/mtk_star_emac.c +++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c @@ -1225,8 +1225,6 @@ static int mtk_star_receive_packet(struc goto push_new_skb; } - desc_data.dma_addr = new_dma_addr; - /* We can't fail anymore at this point: it's safe to unmap the skb. */ mtk_star_dma_unmap_rx(priv, &desc_data); @@ -1236,6 +1234,9 @@ static int mtk_star_receive_packet(struc desc_data.skb->dev = ndev; netif_receive_skb(desc_data.skb); + /* update dma_addr for new skb */ + desc_data.dma_addr = new_dma_addr; + push_new_skb: desc_data.len = skb_tailroom(new_skb); desc_data.skb = new_skb;