When a resource is initialized via of_platform_populate. resource->parent is initialized to NULL via kzalloc. (of_platform_populate->of_device_alloc->of_address_to_resource) If of_platform_depopulate is called later, resource->parent is accessed (Offset 0x30 of address 0), causing a kernel error. This patch evaluates resouce->parent before accessing it. If it is not initialized, -EACCESS is returned. Also a WARN is thrown, so the developer can have a hint about what needs to be fixed. Fixes: BUG: unable to handle kernel NULL pointer deference at 0000000000000030 IP: release_resource+0x26/0x90 Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx> --- kernel/resource.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/resource.c b/kernel/resource.c index 90552aa..b7b270f 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -237,6 +237,9 @@ static int __release_resource(struct resource *old) { struct resource *tmp, **p; + if (WARN_ON(!old->parent)) + return -EINVAL; + p = &old->parent->child; for (;;) { tmp = *p; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html