From 8c552542b81e56ff532dd27ec6e5328954bdda73 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 24 Feb 2021 13:27:52 +0800
Subject: [PATCH] tx_pkt: switch to use qemu_receive_packet_iov() for loopback
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This patch switches to use qemu_receive_receive_iov() which can detect
reentrancy and return early.

This is intended to address CVE-2021-3416.

Cc: Prasad J Pandit <ppandit@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/net_tx_pkt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/net_tx_pkt.c b/hw/net/net_tx_pkt.c
index da262edc3e..1f9aa59eca 100644
--- a/hw/net/net_tx_pkt.c
+++ b/hw/net/net_tx_pkt.c
@@ -553,7 +553,7 @@ static inline void net_tx_pkt_sendv(struct NetTxPkt *pkt,
     NetClientState *nc, const struct iovec *iov, int iov_cnt)
 {
     if (pkt->is_loopback) {
-        nc->info->receive_iov(nc, iov, iov_cnt);
+        qemu_receive_packet_iov(nc, iov, iov_cnt);
     } else {
         qemu_sendv_packet(nc, iov, iov_cnt);
     }