aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.14/950-0005-Protect-__release_resource-against-resources-without.patch
blob: cd6bd549c7f0b756ef31eae4493f1e38fa8b06c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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;