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From: ZY Qiu <quzeyao@gmail.com>
To: Thomas Monjalon <thomas@monjalon.net>,
	Ferruh Yigit <ferruh.yigit@intel.com>,
	Andrew Rybchenko <arybchenko@solarflare.com>
Cc: dev@dpdk.org, ZY Qiu <tgw_team@tencent.com>
Subject: [dpdk-dev] [PATCH v2] rte_ethdev: safer memory access by calling Rx callback
Date: Thu,  5 Mar 2020 01:33:49 +0800
Message-ID: <20200304173349.26459-1-tgw_team@tencent.com> (raw)
In-Reply-To: <20200304140543.31612-1-tgw_team@tencent.com>

When compiling with -O0,
the compiler does not optimize two memory accesses into one.
Leads to accessing a null pointer when queue post Rx burst callback
removal while traffic is running.
See rte_eth_tx_burst function.

Signed-off-by: ZY Qiu <tgw_team@tencent.com>
---
 lib/librte_ethdev/rte_ethdev.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index d1a593ad1..35eb580ff 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -4388,10 +4388,8 @@ rte_eth_rx_burst(uint16_t port_id, uint16_t queue_id,
 				     rx_pkts, nb_pkts);
 
 #ifdef RTE_ETHDEV_RXTX_CALLBACKS
-	if (unlikely(dev->post_rx_burst_cbs[queue_id] != NULL)) {
-		struct rte_eth_rxtx_callback *cb =
-				dev->post_rx_burst_cbs[queue_id];
-
+	struct rte_eth_rxtx_callback *cb = dev->post_rx_burst_cbs[queue_id];
+	if (unlikely(cb != NULL)) {
 		do {
 			nb_rx = cb->fn.rx(port_id, queue_id, rx_pkts, nb_rx,
 						nb_pkts, cb->param);
-- 
2.17.1


  parent reply	other threads:[~2020-03-04 17:34 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-04 14:05 [dpdk-dev] [PATCH] rte_ethdev: fix unsafe memory access by calling RX callback Tencent TGW team
2020-03-04 14:16 ` Andrew Rybchenko
     [not found]   ` <61a6b7d5533643d692c40dc0ab1a2cdc@tencent.com>
2020-03-04 16:26     ` tgw_team(腾讯网关团队)
2020-03-04 16:15 ` Stephen Hemminger
2020-03-04 16:38   ` [dpdk-dev] [PATCH] rte_ethdev: fix unsafe memory access by calling RX callback.(Internet mail) tgw_team(腾讯网关团队)
2020-03-04 17:37     ` Stephen Hemminger
2020-03-04 17:44       ` [dpdk-dev] [PATCH] rte_ethdev: fix unsafe memory access by calling RX callback tgw_team(腾讯网关团队)
2020-03-04 17:33 ` ZY Qiu [this message]
2020-03-04 17:56   ` [dpdk-dev] [PATCH v2] rte_ethdev: safer memory access by calling Rx callback Stephen Hemminger
2020-03-04 18:31     ` tgw_team(腾讯网关团队)
2020-03-05  9:19   ` Bruce Richardson
2020-03-05 11:27     ` Ananyev, Konstantin
2020-03-05 14:23       ` tgw_team(腾讯网关团队)
2020-03-05 14:47       ` Liang, Ma
2020-03-05 15:19         ` Ananyev, Konstantin
2020-03-05 15:42           ` Liang, Ma
2020-03-05 16:47   ` [dpdk-dev] [PATCH v3] rte_ethdev: safer memory access by calling Rx/Tx callback ZY Qiu
2020-03-05 17:23     ` Jerin Jacob
2020-03-11 12:22     ` Ananyev, Konstantin
2020-03-11 12:26       ` Jerin Jacob
2020-10-01 15:14         ` Ferruh Yigit

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