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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 63CF9C33CAF for ; Thu, 16 Jan 2020 17:12:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A5BD20684 for ; Thu, 16 Jan 2020 17:12:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579194766; bh=hpu6Tkyl98vFxhi9jnYRAUwIgGag0U6ndpdJTEwzzOY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=J4/CZvXSyejz4xW5SBF9wrJ3E64BF+gJevpI9UFdLMweEA/fc4BGpycCH+4ryLGqx wA1Vac0ipUmV0c+C22yXSqzmsawFBld8D4oVbuzFWLONH89zOxgoM2ReDHvxbVBCF6 +jgGqnQVR0Es6YrBGO6LEF58IRcUE8kg9Qe4vnMI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390561AbgAPRMp (ORCPT ); Thu, 16 Jan 2020 12:12:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:55956 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389511AbgAPRMm (ORCPT ); Thu, 16 Jan 2020 12:12:42 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E33A224690; Thu, 16 Jan 2020 17:12:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579194761; bh=hpu6Tkyl98vFxhi9jnYRAUwIgGag0U6ndpdJTEwzzOY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HAo/r75QmTrSdnwABpuNGGrSDqrM+XYfKCtmIHE60nsGgXgxChEuGW8znnU9xMwCF jYw/6ww0adlWRE7aOyRBbDfd1FYUYNgOkBHIQhKwrMdoLo+mRHgOvbXh0KK5SMddTZ Ugr2RhDosOVZDpUN70OEo/WXz6VJZFA6zcTw2sZQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Antonio Borneo , Jakub Kicinski , Sasha Levin , netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.19 583/671] net: stmmac: fix length of PTP clock's name string Date: Thu, 16 Jan 2020 12:03:41 -0500 Message-Id: <20200116170509.12787-320-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200116170509.12787-1-sashal@kernel.org> References: <20200116170509.12787-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Antonio Borneo [ Upstream commit 5da202c88f8c355ad79bc2e8eb582e6d433060e7 ] The field "name" in struct ptp_clock_info has a fixed size of 16 chars and is used as zero terminated string by clock_name_show() in drivers/ptp/ptp_sysfs.c The current initialization value requires 17 chars to fit also the null termination, and this causes overflow to the next bytes in the struct when the string is read as null terminated: hexdump -C /sys/class/ptp/ptp0/clock_name 00000000 73 74 6d 6d 61 63 5f 70 74 70 5f 63 6c 6f 63 6b |stmmac_ptp_clock| 00000010 a0 ac b9 03 0a |.....| where the extra 4 bytes (excluding the newline) after the string represent the integer 0x03b9aca0 = 62500000 assigned to the field "max_adj" that follows "name" in the same struct. There is no strict requirement for the "name" content and in the comment in ptp_clock_kernel.h it's reported it should just be 'A short "friendly name" to identify the clock'. Replace it with "stmmac ptp". Signed-off-by: Antonio Borneo Fixes: 92ba6888510c ("stmmac: add the support for PTP hw clock driver") Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c index cc60b3fb0892..8f8b8f381ffd 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c @@ -174,7 +174,7 @@ static int stmmac_enable(struct ptp_clock_info *ptp, /* structure describing a PTP hardware clock */ static struct ptp_clock_info stmmac_ptp_clock_ops = { .owner = THIS_MODULE, - .name = "stmmac_ptp_clock", + .name = "stmmac ptp", .max_adj = 62500000, .n_alarm = 0, .n_ext_ts = 0, -- 2.20.1