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From 6bd4d80f9274f76eb402ce85aa60729150b39980 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 04:56:34 -0400
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Subject: [PATCH 09/14] tftp: check tftp_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: <20210708082537.1550263-6-marcandre.lureau@redhat.com>
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Patchwork-id: 101823
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O-Subject: [RHEL-8.5.0 qemu-kvm PATCH 5/8] tftp: check tftp_input buffer size
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Bugzilla: 1970843
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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-2021-3595
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Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/46
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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=1970843
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(cherry picked from commit 3f17948137155f025f7809fdc38576d5d2451c3d)
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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/tftp.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/slirp/src/tftp.c b/slirp/src/tftp.c
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index 093c2e06a3..07e8f3cb2f 100644
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--- a/slirp/src/tftp.c
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+++ b/slirp/src/tftp.c
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@@ -444,7 +444,11 @@ static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas,
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void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m)
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{
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- struct tftp_t *tp = (struct tftp_t *)m->m_data;
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+ struct tftp_t *tp = mtod_check(m, offsetof(struct tftp_t, x.tp_buf));
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+
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+ if (tp == NULL) {
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+ return;
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+ }
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switch (ntohs(tp->tp_op)) {
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case TFTP_RRQ:
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--
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2.27.0
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