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37 lines
1.0 KiB
37 lines
1.0 KiB
3 years ago
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From 30feadb676a0792036a0f64309235c5767e2ee76 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: Fri, 4 Jun 2021 16:32:55 +0400
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Subject: [PATCH 4/7] 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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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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(cherry picked from commit de71c15de66ba9350bf62c45b05f8fbff166517b)
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---
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src/udp6.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/src/udp6.c b/src/udp6.c
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index fdd8089..236b962 100644
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--- a/src/udp6.c
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+++ b/src/udp6.c
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@@ -29,7 +29,10 @@ 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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2.29.0
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