summary'>refsloglogtreecommitdiffstats
path: '>root//'>sys-kernel/boest-v5.0.15//'>raspberrypi//'>0006-Protect-__release_resource-against-resources-without.patch
blob: ca39c5767e5cbecf82a20d08a2370f47b9c0eb11 (plain) (blame)
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
29
30
From 90bd48eef0575230304602e56245965269929c59 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 13 Mar 2015 12:43:36 +0000
Subject: [PATCH 006/194] 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(+)

diff --git a/kernel/resource.c b/kernel/resource.c
index ca7ed5158cff..b7407b33736b 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -213,6 +213,12 @@ static int __release_resource(struct resource *old, bool release_child)
 {
 	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;