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=-18.8 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=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 17BBAC43381 for ; Mon, 22 Feb 2021 13:58:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C0AF564E76 for ; Mon, 22 Feb 2021 13:58:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232120AbhBVN5q (ORCPT ); Mon, 22 Feb 2021 08:57:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:57154 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231661AbhBVMrd (ORCPT ); Mon, 22 Feb 2021 07:47:33 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id B6EAE64F1A; Mon, 22 Feb 2021 12:42:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1613997750; bh=0ZL2nzoF7r9zTwQRSQ5KBgXhCXIS6ATrdSC1cJocPgQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZDFwDEMqxJFdJFxKpejwBpeXtgC4Y9PTiwES3myL3ro4pCkPtvZf4TC5P/80UGRcP 2xEPI+OtLXJES7bUyFzfLIKpeGwZtgoIueHccfY+U8PxIeDmq/AcVzktu9MaSx5Npz ut/6yze/ae26RlWLvrbsYdvK2RtvN3LPdQPda6oU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Beulich , Juergen Gross Subject: [PATCH 4.9 45/49] xen-netback: dont "handle" error by BUG() Date: Mon, 22 Feb 2021 13:36:43 +0100 Message-Id: <20210222121028.219098483@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210222121022.546148341@linuxfoundation.org> References: <20210222121022.546148341@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: Jan Beulich commit 3194a1746e8aabe86075fd3c5e7cf1f4632d7f16 upstream. In particular -ENOMEM may come back here, from set_foreign_p2m_mapping(). Don't make problems worse, the more that handling elsewhere (together with map's status fields now indicating whether a mapping wasn't even attempted, and hence has to be considered failed) doesn't require this odd way of dealing with errors. This is part of XSA-362. Signed-off-by: Jan Beulich Cc: stable@vger.kernel.org Reviewed-by: Juergen Gross Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- drivers/net/xen-netback/netback.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -1328,13 +1328,11 @@ int xenvif_tx_action(struct xenvif_queue return 0; gnttab_batch_copy(queue->tx_copy_ops, nr_cops); - if (nr_mops != 0) { + if (nr_mops != 0) ret = gnttab_map_refs(queue->tx_map_ops, NULL, queue->pages_to_map, nr_mops); - BUG_ON(ret); - } work_done = xenvif_tx_submit(queue);