From 8c92060d3c0248bd4d515719a35922cd2391b9b4 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 24 Feb 2021 13:14:35 +0800
Subject: [PATCH] sungem: switch to use qemu_receive_packet() for loopback
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This patch switches to use qemu_receive_packet() 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: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/sungem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/sungem.c b/hw/net/sungem.c
index 33c3722df6..3684a4d733 100644
--- a/hw/net/sungem.c
+++ b/hw/net/sungem.c
@@ -306,7 +306,7 @@ static void sungem_send_packet(SunGEMState *s, const uint8_t *buf,
     NetClientState *nc = qemu_get_queue(s->nic);
 
     if (s->macregs[MAC_XIFCFG >> 2] & MAC_XIFCFG_LBCK) {
-        nc->info->receive(nc, buf, size);
+        qemu_receive_packet(nc, buf, size);
     } else {
         qemu_send_packet(nc, buf, size);
     }