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From 6808086932ddc83fd748c46fea495e7004299b55 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
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Date: Thu, 29 Jul 2021 04:56:31 -0400
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Subject: [PATCH 08/14] upd6: check udp6_input buffer size
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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: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: <20210708082537.1550263-5-marcandre.lureau@redhat.com>
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Patchwork-id: 101822
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O-Subject: [RHEL-8.5.0 qemu-kvm PATCH 4/8] upd6: check udp6_input buffer size
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Bugzilla: 1970835
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Marc-André Lureau <marcandre.lureau@redhat.com>
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Fixes: CVE-2021-3593
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Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/45
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1970835
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(cherry picked from commit de71c15de66ba9350bf62c45b05f8fbff166517b)
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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slirp/src/udp6.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/slirp/src/udp6.c b/slirp/src/udp6.c
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index 6f9486bbca..8c490e4d10 100644
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--- a/slirp/src/udp6.c
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+++ b/slirp/src/udp6.c
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@@ -28,7 +28,10 @@ void udp6_input(struct mbuf *m)
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ip = mtod(m, struct ip6 *);
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m->m_len -= iphlen;
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m->m_data += iphlen;
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- uh = mtod(m, struct udphdr *);
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+ uh = mtod_check(m, sizeof(struct udphdr));
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+ if (uh == NULL) {
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+ goto bad;
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+ }
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m->m_len += iphlen;
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m->m_data -= iphlen;
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--
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2.27.0
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