From 07df0f52c26a3819bc02b4f2970b6735bcf15c5b Mon Sep 17 00:00:00 2001
From: Jon Maloy <jmaloy@redhat.com>
Date: Tue, 29 Jun 2021 03:42:42 -0400
Subject: [PATCH 4/9] sungem: switch to use qemu_receive_packet() for loopback
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RH-Author: Jon Maloy <jmaloy@redhat.com>
Message-id: <20210629034247.3286477-5-jmaloy@redhat.com>
Patchwork-id: 101786
O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 4/9] sungem: switch to use qemu_receive_packet() 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_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>

(cherry picked from commit 8c92060d3c0248bd4d515719a35922cd2391b9b4)
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@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 f31d41ac5b..8b202b5c15 100644
--- a/hw/net/sungem.c
+++ b/hw/net/sungem.c
@@ -305,7 +305,7 @@ 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);
     }
-- 
2.27.0

