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=-16.7 required=3.0 tests=BAYES_00, 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 0513EC63697 for ; Wed, 18 Nov 2020 13:05:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A463024181 for ; Wed, 18 Nov 2020 13:05:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726387AbgKRNF1 (ORCPT ); Wed, 18 Nov 2020 08:05:27 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:57433 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725747AbgKRNF1 (ORCPT ); Wed, 18 Nov 2020 08:05:27 -0500 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1kfN9F-0000K3-3q; Wed, 18 Nov 2020 13:05:21 +0000 From: Colin King To: Sunil Goutham , Geetha sowjanya , Subbaraya Sundeep , hariprasad , "David S . Miller" , Jakub Kicinski , Naveen Mamindlapalli , Tomasz Duszynski , netdev@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][next] octeontx2-pf: Fix unintentional sign extension issue Date: Wed, 18 Nov 2020 13:05:20 +0000 Message-Id: <20201118130520.460365-1-colin.king@canonical.com> X-Mailer: git-send-email 2.28.0 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: Colin Ian King The shifting of the u16 result from ntohs(proto) by 16 bits to the left will be promoted to a 32 bit signed int and then sign-extended to a u64. In the event that the top bit of the return from ntohs(proto) is set then all then all the upper 32 bits of a 64 bit long end up as also being set because of the sign-extension. Fix this by casting to a u64 long before the shift. Addresses-Coverity: ("Unintended sign extension") Fixes: f0c2982aaf98 ("octeontx2-pf: Add support for SR-IOV management function") Signed-off-by: Colin Ian King --- drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c index 4c82f60f3cf3..634d60655a74 100644 --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c @@ -2084,7 +2084,7 @@ static int otx2_do_set_vf_vlan(struct otx2_nic *pf, int vf, u16 vlan, u8 qos, vtag_req->vtag_size = VTAGSIZE_T4; vtag_req->cfg_type = 0; /* tx vlan cfg */ vtag_req->tx.cfg_vtag0 = 1; - vtag_req->tx.vtag0 = (ntohs(proto) << 16) | vlan; + vtag_req->tx.vtag0 = ((u64)ntohs(proto) << 16) | vlan; err = otx2_sync_mbox_msg(&pf->mbox); if (err) -- 2.28.0