File 0403-libslirp-upd6-check-udp6_input-buff.patch of Package qemu.20756

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File 0403-libslirp-upd6-check-udp6_input-buff.patch of Package qemu.20756

From: Jose R Ziviani <jose.ziviani@suse.com>
Date: Wed, 7 Jul 2021 11:13:50 -0600
Subject: libslirp: upd6: check udp6_input buffer size
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Git-commit: de71c15de66ba9350bf62c45b05f8fbff166517b
References: bsc#1187365, CVE-2021-3593

Fixes: CVE-2021-3593
Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/45

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Jose R Ziviani <jose.ziviani@suse.com>
---
 slirp/udp6.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/slirp/udp6.c b/slirp/udp6.c
index a23026f2e4d6b4182937b6605063..7f9b6326270aac7aeea608a2cbef 100644
--- a/slirp/udp6.c
+++ b/slirp/udp6.c
@@ -29,7 +29,10 @@ void udp6_input(struct mbuf *m)
     ip = mtod(m, struct ip6 *);
     m->m_len -= iphlen;
     m->m_data += iphlen;
-    uh = mtod(m, struct udphdr *);
+    uh = mtod_check(m, sizeof(struct udphdr));
+    if (uh == NULL) {
+        goto bad;
+    }
     m->m_len += iphlen;
     m->m_data -= iphlen;

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File 0403-libslirp-upd6-check-udp6_input-buff.patch of Package qemu.20756

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