From patchwork Fri Apr 9 13:07:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 12194149 X-Patchwork-Delegate: kuba@kernel.org 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=-16.8 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=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 8AAA9C43460 for ; Fri, 9 Apr 2021 13:07:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E155610FC for ; Fri, 9 Apr 2021 13:07:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233244AbhDINHs (ORCPT ); Fri, 9 Apr 2021 09:07:48 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:45840 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231127AbhDINHq (ORCPT ); Fri, 9 Apr 2021 09:07:46 -0400 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 1lUqr8-00080K-KD; Fri, 09 Apr 2021 13:07:26 +0000 From: Colin King To: Sunil Goutham , "David S . Miller" , Jakub Kicinski , Ganapatrao Kulkarni , David Daney , Sruthi Vangala , Thanneeru Srinivasulu , linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: thunderx: Fix unintentional sign extension issue Date: Fri, 9 Apr 2021 14:07:26 +0100 Message-Id: <20210409130726.665490-1-colin.king@canonical.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Colin Ian King The shifting of the u8 integers rq->caching by 26 bits to the left will be promoted to a 32 bit signed int and then sign-extended to a u64. In the event that rq->caching is greater than 0x1f then all then all the upper 32 bits of the u64 end up as also being set because of the int sign-extension. Fix this by casting the u8 values to a u64 before the 26 bit left shift. Addresses-Coverity: ("Unintended sign extension") Fixes: 4863dea3fab0 ("net: Adding support for Cavium ThunderX network controller") Signed-off-by: Colin Ian King --- drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c index f782e6af45e9..50bbe79fb93d 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c @@ -776,7 +776,7 @@ static void nicvf_rcv_queue_config(struct nicvf *nic, struct queue_set *qs, mbx.rq.msg = NIC_MBOX_MSG_RQ_CFG; mbx.rq.qs_num = qs->vnic_id; mbx.rq.rq_num = qidx; - mbx.rq.cfg = (rq->caching << 26) | (rq->cq_qs << 19) | + mbx.rq.cfg = ((u64)rq->caching << 26) | (rq->cq_qs << 19) | (rq->cq_idx << 16) | (rq->cont_rbdr_qs << 9) | (rq->cont_qs_rbdr_idx << 8) | (rq->start_rbdr_qs << 1) | (rq->start_qs_rbdr_idx);