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=-19.5 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, URIBL_BLOCKED,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 9E8B8C00143 for ; Mon, 26 Jul 2021 15:57:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 867D960FC2 for ; Mon, 26 Jul 2021 15:57:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236576AbhGZPRT (ORCPT ); Mon, 26 Jul 2021 11:17:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:54392 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237435AbhGZPPp (ORCPT ); Mon, 26 Jul 2021 11:15:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 616206103E; Mon, 26 Jul 2021 15:55:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627314920; bh=nvzTvxaIfsXiMvtOfBLZCw0aIBvdfTLeYwKxsutKzBk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k4Pdn7WPIdqpvTl0luI/kCg7bbYRC17HCetlzCPzhCUBRHKHELl/i88cGgIw+8Eia vww0EkPNgAH2w17oWJMjXMBVTBO7qQtyhKT4SKuiCFYjkI+Tdn8wH2MAMWt4uBP7yg O9rpGxgVJBzBdZzMmNfeQIM0uVB32MFecuCykQXY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vinicius Costa Gomes , Erez Geva , Tony Brelinski , Tony Nguyen , Sasha Levin Subject: [PATCH 5.4 002/108] igb: Fix use-after-free error during reset Date: Mon, 26 Jul 2021 17:38:03 +0200 Message-Id: <20210726153831.774564598@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210726153831.696295003@linuxfoundation.org> References: <20210726153831.696295003@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: stable@vger.kernel.org From: Vinicius Costa Gomes [ Upstream commit 7b292608db23ccbbfbfa50cdb155d01725d7a52e ] Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring. Failure to do so can cause invalid memory accesses. If igb_poll() runs while the controller is reset this can lead to the driver try to free a skb that was already freed. (The crash is harder to reproduce with the igb driver, but the same potential problem exists as the code is identical to igc) Fixes: 7cc6fd4c60f2 ("igb: Don't bother clearing Tx buffer_info in igb_clean_tx_ring") Signed-off-by: Vinicius Costa Gomes Reported-by: Erez Geva Tested-by: Tony Brelinski Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/igb/igb_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index c37f0590b3a4..09f2338084e7 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -4657,6 +4657,8 @@ static void igb_clean_tx_ring(struct igb_ring *tx_ring) DMA_TO_DEVICE); } + tx_buffer->next_to_watch = NULL; + /* move us one more past the eop_desc for start of next pkt */ tx_buffer++; i++; -- 2.30.2