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From 128b97f6049144af3c1a41ceb8e8583419edcd69 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 03:42:40 -0400
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Subject: [PATCH 2/9] e1000: 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: <20210629034247.3286477-3-jmaloy@redhat.com>
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Patchwork-id: 101784
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O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 2/9] e1000: 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: Jason Wang <jasowang@redhat.com>
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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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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 1caff0340f49c93d535c6558a5138d20d475315c)
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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/e1000.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/net/e1000.c b/hw/net/e1000.c
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index fe56bccd52..8680b7d46b 100644
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--- a/hw/net/e1000.c
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+++ b/hw/net/e1000.c
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@@ -547,7 +547,7 @@ e1000_send_packet(E1000State *s, const uint8_t *buf, int size)
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NetClientState *nc = qemu_get_queue(s->nic);
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if (s->phy_reg[PHY_CTRL] & MII_CR_LOOPBACK) {
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- nc->info->receive(nc, buf, size);
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+ qemu_receive_packet(nc, buf, size);
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} else {
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qemu_send_packet(nc, buf, size);
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}
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--
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2.27.0
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