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From f641853ee23864c1ea7c36553e6406662b8cd0ba Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 13 Mar 2015 12:43:36 +0000
Subject: [PATCH 005/454] 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
@@ -246,6 +246,12 @@ 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;