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 7F8BCA00C5; Thu, 30 Apr 2020 14:05:17 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 5A2061DB8E; Thu, 30 Apr 2020 14:05:17 +0200 (CEST) Received: from tc-sys-mailedm02.tc.baidu.com (mx56.baidu.com [61.135.168.56]) by dpdk.org (Postfix) with ESMTP id 8702F1DB8E for ; Thu, 30 Apr 2020 14:05:15 +0200 (CEST) Received: from localhost (cp01-cos-dev01.cp01.baidu.com [10.92.119.46]) by tc-sys-mailedm02.tc.baidu.com (Postfix) with ESMTP id 3C24111C0042; Thu, 30 Apr 2020 20:05:12 +0800 (CST) From: yuanlinsi01 To: ajit.khaparde@broadcom.com, somnath.kotur@broadcom.com Cc: dev@dpdk.org Date: Thu, 30 Apr 2020 20:05:12 +0800 Message-Id: <1588248312-7410-1-git-send-email-yuanlinsi01@baidu.com> X-Mailer: git-send-email 1.7.1 Subject: [dpdk-dev] [PATCH] net/bnxt: fix a possible stack smashing 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" We see a stack smashing as a result of defensive code missing. Once the nb_pkts is less than RTE_BNXT_DESCS_PER_LOOP, it will be modified to zero after doing a floor align, and we can not exit the following receiving packets loop. And the buffers will be overwrite, then the stack frame was ruined. Fix the problem by adding defensive code, once the nb_pkts is zero, just directly return with no packets. Signed-off-by: yuanlinsi01 Signed-off-by: rongdongsheng --- drivers/net/bnxt/bnxt_rxtx_vec_sse.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_sse.c b/drivers/net/bnxt/bnxt_rxtx_vec_sse.c index d0e7910e7..c4adccdbc 100644 --- a/drivers/net/bnxt/bnxt_rxtx_vec_sse.c +++ b/drivers/net/bnxt/bnxt_rxtx_vec_sse.c @@ -233,8 +233,13 @@ bnxt_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, /* Return no more than RTE_BNXT_MAX_RX_BURST per call. */ nb_pkts = RTE_MIN(nb_pkts, RTE_BNXT_MAX_RX_BURST); - /* Make nb_pkts an integer multiple of RTE_BNXT_DESCS_PER_LOOP */ + /* + * Make nb_pkts an integer multiple of RTE_BNXT_DESCS_PER_LOOP + * nb_pkts < RTE_BNXT_DESCS_PER_LOOP, just return no packet + */ nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_BNXT_DESCS_PER_LOOP); + if (!nb_pkts) + return 0; /* Handle RX burst request */ while (1) { -- 2.11.0