From 09999d92b1939b5af4ccd9df43358b8b37db1034 Mon Sep 17 00:00:00 2001
From: Andriy Gapon <avg@FreeBSD.org>
Date: Tue, 29 Sep 2015 11:58:21 +0000
Subject: [PATCH] sdt: start checking version field when parsing probe
 definitions

This is an extra safety measure.

MFC after:	21 days
---
 sys/cddl/dev/sdt/sdt.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/cddl/dev/sdt/sdt.c b/sys/cddl/dev/sdt/sdt.c
index a3213174089..a11febeda70 100644
--- a/sys/cddl/dev/sdt/sdt.c
+++ b/sys/cddl/dev/sdt/sdt.c
@@ -141,6 +141,12 @@ sdt_create_probe(struct sdt_probe *probe)
 	char *to;
 	size_t len;
 
+	if (probe->version != (int)sizeof(*probe)) {
+		printf("ignoring probe %p, version %u expected %u\n",
+		    probe, probe->version, (int)sizeof(*probe));
+		return;
+	}
+
 	TAILQ_FOREACH(prov, &sdt_prov_list, prov_entry)
 		if (strcmp(prov->name, probe->prov->name) == 0)
 			break;