From fd4dd0612e2b97840bb5ca1699ff7d779704c4a9 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 13 Mar 2015 12:43:36 +0000
Subject: [PATCH 0066/1085] Protect __release_resource against resources
 without parents

Without this patch, removing a device tree overlay can crash here.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 kernel/resource.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -200,6 +200,12 @@ static int __release_resource(struct res
 {
 	struct resource *tmp, **p, *chd;
 
+	if (!old->parent) {
+		WARN(old->sibling, "sibling but no parent");
+		if (old->sibling)
+			return -EINVAL;
+		return 0;
+	}
 	p = &old->parent->child;
 	for (;;) {
 		tmp = *p;