From 25d5ceed31dd5e9256ebb4479397bfb5eed78155 Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@gnupg.org>
Date: Sun, 11 Sep 2016 12:05:04 +0200
Subject: ipc: Fix crash in debug code.

* ipc/mach_debug.c (mach_port_kernel_object): Check that the receiver
is valid.
---
 ipc/mach_debug.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ipc/mach_debug.c b/ipc/mach_debug.c
index efb07a4f..6ddc89b2 100644
--- a/ipc/mach_debug.c
+++ b/ipc/mach_debug.c
@@ -257,6 +257,9 @@ mach_port_kernel_object(
 	ipc_port_t port;
 	kern_return_t kr;
 
+	if (space == IS_NULL)
+		return KERN_INVALID_TASK;
+
 	kr = ipc_right_lookup_read(space, name, &entry);
 	if (kr != KERN_SUCCESS)
 		return kr;
-- 
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