Subject: [PATCH 08/10] pcnet: switch to use qemu_receive_packet() for loopback

From: Alexander Bulekov <[email-masked]>
Date: Mon, 1 Mar 2021 10:33:34 -0500

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 <[email-masked]>
Cc: [email-masked]
Buglink: https://bugs.launchpad.net/qemu/+bug/1917085
Reviewed-by: Philippe Mathieu-Daudé <[email-masked]
Signed-off-by: Alexander Bulekov <[email-masked]>
Signed-off-by: Jason Wang <[email-masked]>

Upstream-Status: Backport [99ccfaa1edafd79f7a3a0ff7b58ae4da7c514928]
CVE: CVE-2021-3416

Signed-off-by: Sakib Sajal <[email-masked]>
---
 hw/net/pcnet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index f3f18d859..dcd3fc494 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -1250,7 +1250,7 @@ txagain:
             if (BCR_SWSTYLE(s) == 1)
                 add_crc = !GET_FIELD(tmd.status, TMDS, NOFCS);
             s->looptest = add_crc ? PCNET_LOOPTEST_CRC : PCNET_LOOPTEST_NOCRC;
-            pcnet_receive(qemu_get_queue(s->nic), s->buffer, s->xmit_pos);
+            qemu_receive_packet(qemu_get_queue(s->nic), s->buffer, s->xmit_pos);
             s->looptest = 0;
         } else {
             if (s->nic) {
-- 
2.29.2