From bf44928b2ac2cb8b9608209d5425533458fd2b8a Mon Sep 17 00:00:00 2001
From: Jon Maloy <jmaloy@redhat.com>
Date: Tue, 29 Jun 2021 03:42:40 -0400
Subject: [PATCH 2/9] e1000: switch to use qemu_receive_packet() for loopback
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RH-Author: Jon Maloy <jmaloy@redhat.com>
Message-id: <20210629034247.3286477-3-jmaloy@redhat.com>
Patchwork-id: 101784
O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 2/9] e1000: 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: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

(cherry picked from commit 1caff0340f49c93d535c6558a5138d20d475315c)
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/net/e1000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index fc73fdd6fa..f6ae78748a 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -547,7 +547,7 @@ e1000_send_packet(E1000State *s, const uint8_t *buf, int size)
 
     NetClientState *nc = qemu_get_queue(s->nic);
     if (s->phy_reg[PHY_CTRL] & MII_CR_LOOPBACK) {
-        nc->info->receive(nc, buf, size);
+        qemu_receive_packet(nc, buf, size);
     } else {
         qemu_send_packet(nc, buf, size);
     }
-- 
2.27.0