target/linux/bcm27xx/patches-5.10/950-0009-Protect-__release_resource-against-resources-without.patch

   1 From f146f2bb597fe00b6c2e5da169a766dc8ab2a4fa 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
   5  parents
   6
   7 Without this patch, removing a device tree overlay can crash here.
   8
   9 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  10 ---
  11  kernel/resource.c | 6 ++++++
  12  1 file changed, 6 insertions(+)
  13
  14 --- a/kernel/resource.c
  15 +++ b/kernel/resource.c
  16 @@ -214,6 +214,12 @@ static int __release_resource(struct res
  17  {
  18         struct resource *tmp, **p, *chd;
  19
  20 +       if (!old->parent) {
  21 +               WARN(old->sibling, "sibling but no parent");
  22 +               if (old->sibling)
  23 +                       return -EINVAL;
  24 +               return 0;
  25 +       }
  26         p = &old->parent->child;
  27         for (;;) {
  28                 tmp = *p;