From 199915a03857c1e4e0a6ac90a46496b1a8abd702 Mon Sep 17 00:00:00 2001
From: Jon Maloy <jmaloy@redhat.com>
Date: Tue, 29 Jun 2021 03:42:43 -0400
Subject: [PATCH 5/9] tx_pkt: switch to use qemu_receive_packet_iov() for
 loopback
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RH-Author: Jon Maloy <jmaloy@redhat.com>
Message-id: <20210629034247.3286477-6-jmaloy@redhat.com>
Patchwork-id: 101788
O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 5/9] tx_pkt: switch to use qemu_receive_packet_iov() for loopback
Bugzilla: 1932917
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>

From: Jason Wang <jasowang@redhat.com>

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>

(cherry picked from commit 8c552542b81e56ff532dd27ec6e5328954bdda73)
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@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 54d4c3bbd0..646cdfaf4d 100644
--- a/hw/net/net_tx_pkt.c
+++ b/hw/net/net_tx_pkt.c
@@ -544,7 +544,7 @@ 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);
     }
-- 
2.27.0