File 0400-libslirp-bootp-check-bootp_input-bu.patch of Package qemu.20756

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File 0400-libslirp-bootp-check-bootp_input-bu.patch of Package qemu.20756

From: Jose R Ziviani <jose.ziviani@suse.com>
Date: Tue, 6 Jul 2021 17:13:28 -0600
Subject: libslirp: bootp: check bootp_input buffer size
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Git-commit: 2eca0838eee1da96204545e22cdaed860d9d7c6c
References: bsc#1187364, CVE-2021-3592

Fixes: CVE-2021-3592
Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/44

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Jose R Ziviani <jose.ziviani@suse.com>
---
 slirp/bootp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/slirp/bootp.c b/slirp/bootp.c
index 59c7cc0bf4594e01c5bf3f7f2d0c..457008b6ed26f36796691c8f05f9 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -344,9 +344,9 @@ static void bootp_reply(Slirp *slirp,
 
 void bootp_input(struct mbuf *m)
 {
-    struct bootp_t *bp = mtod(m, struct bootp_t *);
+    struct bootp_t *bp = mtod_check(m, sizeof(struct bootp_t));
 
-    if (bp->bp_op == BOOTP_REQUEST) {
+    if (bp && bp->bp_op == BOOTP_REQUEST) {
         bootp_reply(m->slirp, bp, m_end(m));
     }
 }

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File 0400-libslirp-bootp-check-bootp_input-bu.patch of Package qemu.20756

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