From beaa8c1788fa201ca4e4c8dc58b96c8d67ae8389 Mon Sep 17 00:00:00 2001
From: Alexander Bulekov <alxndr@bu.edu>
Date: Fri, 14 May 2021 10:35:11 +0800
Subject: [PATCH] rtl8139: switch to use qemu_receive_packet() for loopback
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Fix CVE-2021-3416

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
Buglink: https://bugs.launchpad.net/qemu/+bug/1910826
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Jason Wang <jasowang@redhat.com>

Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
---
 hw/net/rtl8139.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 09273171e5..79584fbb17 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -1792,7 +1792,7 @@ static void rtl8139_transfer_frame(RTL8139State *s, uint8_t *buf, int size,
         }
 
         DPRINTF("+++ transmit loopback mode\n");
-        rtl8139_do_receive(qemu_get_queue(s->nic), buf, size, do_interrupt);
+        qemu_receive_packet(qemu_get_queue(s->nic), buf, size);
 
         if (iov) {
             g_free(buf2);
-- 
2.27.0

