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 C2CE3C3F2D7 for ; Tue, 3 Mar 2020 02:58:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99DDA2166E for ; Tue, 3 Mar 2020 02:58:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583204303; bh=EhwLsa/pL+ESdkYGrVc5xS//CRvMztHyMMUQm036fLU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rQGf+gFzJO5NwusY0RcLIYr+qSM5Tg/HFJUKh6TkGh26La9CFB3q9ENMYy/B4D6ss Ujwu4pVGBvNCeyq7zpqDteHZEtJtrFKsKbClmU51AM8SRBgsF21QNIqBuj1NmWRLCU OY/TJjcV3bHuqPzeo9YkMh9sj3hudZed9K/glCSY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728972AbgCCC6W (ORCPT ); Mon, 2 Mar 2020 21:58:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:43650 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728301AbgCCCsI (ORCPT ); Mon, 2 Mar 2020 21:48:08 -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 914FE24681; Tue, 3 Mar 2020 02:48:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583203687; bh=EhwLsa/pL+ESdkYGrVc5xS//CRvMztHyMMUQm036fLU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VjfoHwJegJX4SyU1Z6ySuSf8m4hCjITOoJVjqcNTpDpba28WlNWYDCGdbPJrm4QtB 3Upd9CnErkw0XdG9WdnuWt28q9Vo9pZNrd1q5O5sMYa6pC4WN7Wje2wIzm3dRtOJXf UTDeYQ/H4IMXUV8hSBmQKYDvYiEVuCaYZNQXsl4g= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pavel Belous , Christophe Vu-Brugier , Igor Russkikh , Dmitry Bogdanov , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 22/58] net: atlantic: fix use after free kasan warn Date: Mon, 2 Mar 2020 21:47:04 -0500 Message-Id: <20200303024740.9511-22-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200303024740.9511-1-sashal@kernel.org> References: <20200303024740.9511-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review 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: Pavel Belous [ Upstream commit a4980919ad6a7be548d499bc5338015e1a9191c6 ] skb->len is used to calculate statistics after xmit invocation. Under a stress load it may happen that skb will be xmited, rx interrupt will come and skb will be freed, all before xmit function is even returned. Eventually, skb->len will access unallocated area. Moving stats calculation into tx_clean routine. Fixes: 018423e90bee ("net: ethernet: aquantia: Add ring support code") Reported-by: Christophe Vu-Brugier Signed-off-by: Igor Russkikh Signed-off-by: Pavel Belous Signed-off-by: Dmitry Bogdanov Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 4 ---- drivers/net/ethernet/aquantia/atlantic/aq_ring.c | 7 +++++-- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c index 137c1de4c6ec0..87deba884b886 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c @@ -598,10 +598,6 @@ int aq_nic_xmit(struct aq_nic_s *self, struct sk_buff *skb) if (likely(frags)) { err = self->aq_hw_ops->hw_ring_tx_xmit(self->aq_hw, ring, frags); - if (err >= 0) { - ++ring->stats.tx.packets; - ring->stats.tx.bytes += skb->len; - } } else { err = NETDEV_TX_BUSY; } diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c index 76bdbe1596d62..03821b46a8cb4 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c @@ -243,9 +243,12 @@ bool aq_ring_tx_clean(struct aq_ring_s *self) } } - if (unlikely(buff->is_eop)) - dev_kfree_skb_any(buff->skb); + if (unlikely(buff->is_eop)) { + ++self->stats.rx.packets; + self->stats.tx.bytes += buff->skb->len; + dev_kfree_skb_any(buff->skb); + } buff->pa = 0U; buff->eop_index = 0xffffU; self->sw_head = aq_ring_next_dx(self, self->sw_head); -- 2.20.1