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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 19BA0C10F27 for ; Wed, 11 Mar 2020 08:38:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEC8620848 for ; Wed, 11 Mar 2020 08:38:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728673AbgCKIiK (ORCPT ); Wed, 11 Mar 2020 04:38:10 -0400 Received: from mx2.suse.de ([195.135.220.15]:50160 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728668AbgCKIiE (ORCPT ); Wed, 11 Mar 2020 04:38:04 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 12102B1C0; Wed, 11 Mar 2020 08:38:02 +0000 (UTC) From: Takashi Iwai To: netdev@vger.kernel.org Cc: "David S . Miller" , Jakub Kicinski , oss-drivers@netronome.com Subject: [PATCH 5/7] ionic: Use scnprintf() for avoiding potential buffer overflow Date: Wed, 11 Mar 2020 09:37:43 +0100 Message-Id: <20200311083745.17328-6-tiwai@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200311083745.17328-1-tiwai@suse.de> References: <20200311083745.17328-1-tiwai@suse.de> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Cc: Jakub Kicinski Cc: oss-drivers@netronome.com Signed-off-by: Takashi Iwai --- drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c | 2 +- drivers/net/ethernet/pensando/ionic/ionic_lif.c | 12 ++++++------ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c index cc311989e3d7..7d518999250d 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c @@ -616,7 +616,7 @@ static int enable_bars(struct nfp6000_pcie *nfp, u16 interface) if (bar->iomem) { int pf; - msg += scnprintf(msg, end - msg, "0.0: General/MSI-X SRAM, "); + msg += scnprintf(msg, end - msg, "0.0: General/MSI-X SRAM, "); atomic_inc(&bar->refcnt); bars_free--; diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c index c2f5b691e0fa..09c776191edd 100644 --- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c +++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c @@ -948,18 +948,18 @@ static void ionic_lif_rx_mode(struct ionic_lif *lif, unsigned int rx_mode) int i; #define REMAIN(__x) (sizeof(buf) - (__x)) - i = snprintf(buf, sizeof(buf), "rx_mode 0x%04x -> 0x%04x:", + i = scnprintf(buf, sizeof(buf), "rx_mode 0x%04x -> 0x%04x:", lif->rx_mode, rx_mode); if (rx_mode & IONIC_RX_MODE_F_UNICAST) - i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_UNICAST"); + i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_UNICAST"); if (rx_mode & IONIC_RX_MODE_F_MULTICAST) - i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_MULTICAST"); + i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_MULTICAST"); if (rx_mode & IONIC_RX_MODE_F_BROADCAST) - i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_BROADCAST"); + i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_BROADCAST"); if (rx_mode & IONIC_RX_MODE_F_PROMISC) - i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_PROMISC"); + i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_PROMISC"); if (rx_mode & IONIC_RX_MODE_F_ALLMULTI) - i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_ALLMULTI"); + i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_ALLMULTI"); netdev_dbg(lif->netdev, "lif%d %s\n", lif->index, buf); err = ionic_adminq_post_wait(lif, &ctx); -- 2.16.4