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36 lines
1.0 KiB
36 lines
1.0 KiB
From ca41f7eaa58d3f63a3df58d812b3cec32343ab6a 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 16:40:23 +0400 |
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Subject: [PATCH 7/7] udp: check upd_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-2021-3594 |
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Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/47 |
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> |
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(cherry picked from commit 74572be49247c8c5feae7c6e0b50c4f569ca9824) |
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--- |
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src/udp.c | 5 ++++- |
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1 file changed, 4 insertions(+), 1 deletion(-) |
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diff --git a/src/udp.c b/src/udp.c |
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index 050cee4..e4578aa 100644 |
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--- a/src/udp.c |
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+++ b/src/udp.c |
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@@ -94,7 +94,10 @@ void udp_input(register struct mbuf *m, int iphlen) |
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/* |
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* Get IP and UDP header together in first mbuf. |
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*/ |
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- ip = mtod(m, struct ip *); |
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+ ip = mtod_check(m, iphlen + sizeof(struct udphdr)); |
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+ if (ip == NULL) { |
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+ goto bad; |
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+ } |
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uh = (struct udphdr *)((char *)ip + iphlen); |
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/* |
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-- |
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2.29.0 |
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