37 lines
1.1 KiB
Diff
37 lines
1.1 KiB
Diff
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From ab454ca5f45a842b2517a0f4eb786b6ea3019d5a 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 16:15:14 +0400
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Subject: [PATCH 3/6] bootp: check bootp_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-2021-3592
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Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/44
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: imxcc <xingchaochao@huawei.com>
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---
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slirp/src/bootp.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/slirp/src/bootp.c b/slirp/src/bootp.c
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index 57543271..57891871 100644
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--- a/slirp/src/bootp.c
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+++ b/slirp/src/bootp.c
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@@ -366,9 +366,9 @@ udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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void bootp_input(struct mbuf *m)
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{
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- struct bootp_t *bp = mtod(m, struct bootp_t *);
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+ struct bootp_t *bp = mtod_check(m, sizeof(struct bootp_t));
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- if (bp->bp_op == BOOTP_REQUEST) {
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+ if (bp && bp->bp_op == BOOTP_REQUEST) {
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bootp_reply(m->slirp, bp, m_end(m));
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}
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}
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--
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2.27.0
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