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From 3427c5573a7ab788e0c39e30b4d0ed5db85f03b3 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Tue, 29 Jun 2021 03:42:45 -0400
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Subject: [PATCH 7/9] pcnet: switch to use qemu_receive_packet() for loopback
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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Message-id: <20210629034247.3286477-8-jmaloy@redhat.com>
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Patchwork-id: 101791
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O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 7/9] pcnet: switch to use qemu_receive_packet() for loopback
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Bugzilla: 1932917
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Alexander Bulekov <alxndr@bu.edu>
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This patch switches to use qemu_receive_packet() which can detect
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reentrancy and return early.
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This is intended to address CVE-2021-3416.
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Cc: Prasad J Pandit <ppandit@redhat.com>
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Cc: qemu-stable@nongnu.org
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Buglink: https://bugs.launchpad.net/qemu/+bug/1917085
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Reviewed-by: Philippe Mathieu-Daudé
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 99ccfaa1edafd79f7a3a0ff7b58ae4da7c514928)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/net/pcnet.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
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index f3f18d8598..dcd3fc4948 100644
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--- a/hw/net/pcnet.c
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+++ b/hw/net/pcnet.c
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@@ -1250,7 +1250,7 @@ txagain:
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if (BCR_SWSTYLE(s) == 1)
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add_crc = !GET_FIELD(tmd.status, TMDS, NOFCS);
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s->looptest = add_crc ? PCNET_LOOPTEST_CRC : PCNET_LOOPTEST_NOCRC;
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- pcnet_receive(qemu_get_queue(s->nic), s->buffer, s->xmit_pos);
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+ qemu_receive_packet(qemu_get_queue(s->nic), s->buffer, s->xmit_pos);
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s->looptest = 0;
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} else {
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if (s->nic) {
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--
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2.27.0
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