From a6f0bef82cdd84844a06dac1e6d279d95824d827 Mon Sep 17 00:00:00 2001
From: Jon Maloy <jmaloy@redhat.com>
Date: Tue, 29 Jun 2021 03:42:41 -0400
Subject: [PATCH 3/9] dp8393x: switch to use qemu_receive_packet() for loopback
 packet
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RH-Author: Jon Maloy <jmaloy@redhat.com>
Message-id: <20210629034247.3286477-4-jmaloy@redhat.com>
Patchwork-id: 101789
O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 3/9] dp8393x: switch to use qemu_receive_packet() for loopback packet
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: Philippe Mathieu-Daudé <philmd@redhat.com
Signed-off-by: Jason Wang <jasowang@redhat.com>

(cherry picked from commit 331d2ac9ea307c990dc86e6493e8f0c48d14bb33)
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/net/dp8393x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
index 3d991af163..6d55b5de64 100644
--- a/hw/net/dp8393x.c
+++ b/hw/net/dp8393x.c
@@ -482,7 +482,7 @@ static void dp8393x_do_transmit_packets(dp8393xState *s)
             s->regs[SONIC_TCR] |= SONIC_TCR_CRSL;
             if (nc->info->can_receive(nc)) {
                 s->loopback_packet = 1;
-                nc->info->receive(nc, s->tx_buffer, tx_len);
+                qemu_receive_packet(nc, s->tx_buffer, tx_len);
             }
         } else {
             /* Transmit packet */
-- 
2.27.0