39 lines
1.1 KiB
Diff
39 lines
1.1 KiB
Diff
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From 0f7224535cdfec549cd43a5ae4ccde936f50ee95 Mon Sep 17 00:00:00 2001
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From: Samuel Thibault <samuel.thibault@ens-lyon.org>
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Date: Wed, 11 Mar 2020 17:33:46 +0800
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Subject: [PATCH] tcp_emu: Fix oob access
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The main loop only checks for one available byte, while we sometimes
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need two bytes.
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---
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slirp/src/tcp_subr.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/slirp/src/tcp_subr.c b/slirp/src/tcp_subr.c
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index fde9207b..4608942f 100644
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--- a/slirp/src/tcp_subr.c
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+++ b/slirp/src/tcp_subr.c
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@@ -895,6 +895,9 @@ tcp_emu(struct socket *so, struct mbuf *m)
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break;
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case 5:
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+ if (bptr == m->m_data + m->m_len - 1)
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+ return 1; /* We need two bytes */
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+
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/*
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* The difference between versions 1.0 and
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* 2.0 is here. For future versions of
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@@ -910,6 +913,9 @@ tcp_emu(struct socket *so, struct mbuf *m)
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/* This is the field containing the port
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* number that RA-player is listening to.
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*/
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+ if (bptr == m->m_data + m->m_len - 1)
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+ return 1; /* We need two bytes */
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+
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lport = (((uint8_t*)bptr)[0] << 8)
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+ ((uint8_t *)bptr)[1];
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if (lport < 6970)
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--
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2.21.1 (Apple Git-122.3)
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