39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Samuel Thibault <samuel.thibault@ens-lyon.org>
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Date: Sun, 28 Jul 2019 19:11:24 +0200
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Subject: [PATCH] Fix heap overflow in ip_reass on big packet input
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When the first fragment does not fit in the preallocated buffer, q will
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already be pointing to the ext buffer, so we mustn't try to update it.
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Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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---
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slirp/src/ip_input.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/slirp/src/ip_input.c b/slirp/src/ip_input.c
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index a714fecd58..0ccb78317f 100644
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--- a/slirp/src/ip_input.c
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+++ b/slirp/src/ip_input.c
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@@ -331,6 +331,8 @@ insert:
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q = fp->frag_link.next;
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m = dtom(slirp, q);
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+ int was_ext = m->m_flags & M_EXT;
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+
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q = (struct ipasfrag *) q->ipf_next;
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while (q != (struct ipasfrag*)&fp->frag_link) {
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struct mbuf *t = dtom(slirp, q);
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@@ -353,7 +355,7 @@ insert:
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* the old buffer (in the mbuf), so we must point ip
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* into the new buffer.
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*/
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- if (m->m_flags & M_EXT) {
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+ if (!was_ext && m->m_flags & M_EXT) {
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int delta = (char *)q - m->m_dat;
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q = (struct ipasfrag *)(m->m_ext + delta);
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}
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--
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2.20.1
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