target/linux/brcm2708/patches-4.9/950-0004-Protect-__release_resource-against-resources-without.patch

   1 From 3115fe312a2c751954f1ab0f0ba07aea1c1c7d1b Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 13 Mar 2015 12:43:36 +0000
   4 Subject: [PATCH] Protect __release_resource against resources without parents
   5
   6 Without this patch, removing a device tree overlay can crash here.
   7
   8 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
   9 ---
  10  kernel/resource.c | 6 ++++++
  11  1 file changed, 6 insertions(+)
  12
  13 --- a/kernel/resource.c
  14 +++ b/kernel/resource.c
  15 @@ -246,6 +246,12 @@ static int __release_resource(struct res
  16  {
  17         struct resource *tmp, **p, *chd;
  18
  19 +       if (!old->parent) {
  20 +               WARN(old->sibling, "sibling but no parent");
  21 +               if (old->sibling)
  22 +                       return -EINVAL;
  23 +               return 0;
  24 +       }
  25         p = &old->parent->child;
  26         for (;;) {
  27                 tmp = *p;