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From 94ca0eddc117b57da009dacb19740fc8ae00143a Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Mon, 28 Sep 2020 18:27:35 -0400
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Subject: [PATCH] hw/net/net_tx_pkt: fix assertion failure in
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net_tx_pkt_add_raw_fragment()
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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Message-id: <20200928182735.1008839-2-jmaloy@redhat.com>
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Patchwork-id: 98497
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O-Subject: [RHEL-8.0.0 qemu-kvm PATCH 1/1] hw/net/net_tx_pkt: fix assertion failure in net_tx_pkt_add_raw_fragment()
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Bugzilla: 1860994
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Xiao Wang <jasowang@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Mauro Matteo Cascella <mcascell@redhat.com>
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An assertion failure issue was found in the code that processes network packets
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while adding data fragments into the packet context. It could be abused by a
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malicious guest to abort the QEMU process on the host. This patch replaces the
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affected assert() with a conditional statement, returning false if the current
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data fragment exceeds max_raw_frags.
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Reported-by: Alexander Bulekov <alxndr@bu.edu>
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Reported-by: Ziming Zhang <ezrakiez@gmail.com>
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Reviewed-by: Dmitry Fleytman <dmitry.fleytman@gmail.com>
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Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 035e69b063835a5fd23cacabd63690a3d84532a8)
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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/net_tx_pkt.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/hw/net/net_tx_pkt.c b/hw/net/net_tx_pkt.c
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index 162f802dd77..54d4c3bbd02 100644
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--- a/hw/net/net_tx_pkt.c
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+++ b/hw/net/net_tx_pkt.c
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@@ -379,7 +379,10 @@ bool net_tx_pkt_add_raw_fragment(struct NetTxPkt *pkt, hwaddr pa,
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hwaddr mapped_len = 0;
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struct iovec *ventry;
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assert(pkt);
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- assert(pkt->max_raw_frags > pkt->raw_frags);
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+
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+ if (pkt->raw_frags >= pkt->max_raw_frags) {
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+ return false;
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+ }
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if (!len) {
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return true;
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--
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2.27.0
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