From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 37C77A04B4; Tue, 19 Nov 2019 13:24:21 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 5566E2AB; Tue, 19 Nov 2019 13:24:20 +0100 (CET) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id D29AA271; Tue, 19 Nov 2019 13:24:17 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Nov 2019 04:24:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,322,1569308400"; d="scan'208";a="209406470" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.96]) ([10.237.221.96]) by orsmga006.jf.intel.com with ESMTP; 19 Nov 2019 04:24:15 -0800 To: Andrew Rybchenko , Thomas Monjalon Cc: dev@dpdk.org, stable@dpdk.org References: <1574151770-25925-1-git-send-email-arybchenko@solarflare.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] ethdev: avoid undefined behaviour on configuration copying X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 11/19/2019 8:22 AM, Andrew Rybchenko wrote: > memcpy() source and destination areas must not overlap and equal > pointers is the case which is really met, so handle it. Agree providing same config as input can cause problem with current implementation, but it is the limitation of the memcpy, the API doesn't request this. We can fix as you suggested, in this case we should document this in API documentation I think, we can also solve this by updating the implementation to let this, using an interim buffer in the simplest measure, not sure which one is better. Any practical reason to prevent this other than 'memcpy' limitation? > > Fixes: 68b931bff287 ("ethdev: eliminate interim variable") > Cc: stable@dpdk.org > > Signed-off-by: Andrew Rybchenko > --- > slave_configure() in drivers/net/bonding calls rte_eth_dev_configure() > with &slave_eth_dev->data->dev_conf. > > Alternative solution is to fix bonding and return error if dev_conf is > equal to &dev->data->dev_conf since usecase is unclear and callers > should not use dev->data. > > lib/librte_ethdev/rte_ethdev.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c > index 8f48e8d659..8d2ce31a81 100644 > --- a/lib/librte_ethdev/rte_ethdev.c > +++ b/lib/librte_ethdev/rte_ethdev.c > @@ -1245,7 +1245,9 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q, > * Copy the dev_conf parameter into the dev structure. > * rte_eth_dev_info_get() requires dev_conf, copy it before dev_info get > */ > - memcpy(&dev->data->dev_conf, dev_conf, sizeof(dev->data->dev_conf)); > + if (dev_conf != &dev->data->dev_conf) > + memcpy(&dev->data->dev_conf, dev_conf, > + sizeof(dev->data->dev_conf)); > > ret = rte_eth_dev_info_get(port_id, &dev_info); > if (ret != 0) >