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 1B612A0350; Mon, 22 Jun 2020 10:10:56 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 3E61E1D5E2; Mon, 22 Jun 2020 10:10:51 +0200 (CEST) Received: from huawei.com (szxga07-in.huawei.com [45.249.212.35]) by dpdk.org (Postfix) with ESMTP id 75AF11D5A9 for ; Mon, 22 Jun 2020 10:10:45 +0200 (CEST) Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 00CE339E696E60EFD45B; Mon, 22 Jun 2020 16:10:44 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.487.0; Mon, 22 Jun 2020 16:10:37 +0800 From: "Wei Hu (Xavier)" To: , , , , , , , , , , , , , , , , , , , , , CC: , Date: Mon, 22 Jun 2020 16:08:59 +0800 Message-ID: <1592813340-44094-2-git-send-email-xavier.huwei@huawei.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1592813340-44094-1-git-send-email-xavier.huwei@huawei.com> References: <1592813340-44094-1-git-send-email-xavier.huwei@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.56] X-CFilter-Loop: Reflected Subject: [dpdk-dev] [PATCH v4 1/2] ethdev: fix data room size verification in Rx queue setup 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" In the rte_eth_rx_queue_setup API function, the local variable named mbp_buf_size, which is the data room size of the input parameter mp, is checked to guarantee that each memory chunck used for net device in the mbuf is bigger than the min_rx_bufsize. But if mbp_buf_size is less than RTE_PKTMBUF_HEADROOM, the value of the following statement will be a large number since the mbp_buf_size is a unsigned value. mbp_buf_size - RTE_PKTMBUF_HEADROOM As a result, it will cause a segment fault in this situation. This patch fixes it by modify the check condition to guarantee that the local varibale named mbp_buf_size is bigger than RTE_PKTMBUF_HEADROOM. Fixes: af75078fece3 ("first public release") Cc: stable@dpdk.org Signed-off-by: Chengchang Tang Signed-off-by: Wei Hu (Xavier) Reviewed-by: Andrew Rybchenko --- v3 -> v4: No change. v2 -> v3: No change. v1 -> v2: Simplify the check condition of mbp_buf_size according to Andrew Rybchenko's comment. --- lib/librte_ethdev/rte_ethdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c index 8e10a6f..b0b0474 100644 --- a/lib/librte_ethdev/rte_ethdev.c +++ b/lib/librte_ethdev/rte_ethdev.c @@ -1822,7 +1822,7 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id, } mbp_buf_size = rte_pktmbuf_data_room_size(mp); - if ((mbp_buf_size - RTE_PKTMBUF_HEADROOM) < dev_info.min_rx_bufsize) { + if (mbp_buf_size < dev_info.min_rx_bufsize + RTE_PKTMBUF_HEADROOM) { RTE_ETHDEV_LOG(ERR, "%s mbuf_data_room_size %d < %d (RTE_PKTMBUF_HEADROOM=%d + min_rx_bufsize(dev)=%d)\n", mp->name, (int)mbp_buf_size, -- 2.7.4