From e93b464d004e23b7e58e159e6fec69e62351e72b Mon Sep 17 00:00:00 2001
From: trasz <trasz@FreeBSD.org>
Date: Sun, 18 Oct 2015 14:36:04 +0000
Subject: MFC r286283:

Fix panic triggered by code like this:
open("/dev/md0", O_EXEC);

Sponsored by:	The FreeBSD Foundation
---
 sys/geom/geom_dev.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'sys')

diff --git a/sys/geom/geom_dev.c b/sys/geom/geom_dev.c
index bf2ba9e..1123323 100644
--- a/sys/geom/geom_dev.c
+++ b/sys/geom/geom_dev.c
@@ -356,6 +356,13 @@ g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
 #else
 	e = 0;
 #endif
+
+	/*
+	 * This happens on attempt to open a device node with O_EXEC.
+	 */
+	if (r + w + e == 0)
+		return (EINVAL);
+
 	if (w) {
 		/*
 		 * When running in very secure mode, do not allow
-- 
cgit v1.1