This is a note to let you know that I've just added the patch titled of: Don't allow __of_attached_node_sysfs() without CONFIG_SYSFS to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: of-don-t-allow-__of_attached_node_sysfs-without-conf.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 7039e066e9b8314aac06ed2af512854d2d09324f Author: Marc Zyngier <maz@xxxxxxxxxx> Date: Fri Aug 20 15:47:22 2021 +0100 of: Don't allow __of_attached_node_sysfs() without CONFIG_SYSFS [ Upstream commit 6211e9cb2f8faf7faae0b6caf844bfe9527cc607 ] Trying to boot without SYSFS, but with OF_DYNAMIC quickly results in a crash: [ 0.088460] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000070 [...] [ 0.103927] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.14.0-rc3 #4179 [ 0.105810] Hardware name: linux,dummy-virt (DT) [ 0.107147] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) [ 0.108876] pc : kernfs_find_and_get_ns+0x3c/0x7c [ 0.110244] lr : kernfs_find_and_get_ns+0x3c/0x7c [...] [ 0.134087] Call trace: [ 0.134800] kernfs_find_and_get_ns+0x3c/0x7c [ 0.136054] safe_name+0x4c/0xd0 [ 0.136994] __of_attach_node_sysfs+0xf8/0x124 [ 0.138287] of_core_init+0x90/0xfc [ 0.139296] driver_init+0x30/0x4c [ 0.140283] kernel_init_freeable+0x160/0x1b8 [ 0.141543] kernel_init+0x30/0x140 [ 0.142561] ret_from_fork+0x10/0x18 While not having sysfs isn't a very common option these days, it is still expected that such configuration would work. Paper over it by bailing out from __of_attach_node_sysfs() if CONFIG_SYSFS isn't enabled. Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210820144722.169226-1-maz@xxxxxxxxxx Signed-off-by: Rob Herring <robh@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/of/kobj.c b/drivers/of/kobj.c index a32e60b024b8..6675b5e56960 100644 --- a/drivers/of/kobj.c +++ b/drivers/of/kobj.c @@ -119,7 +119,7 @@ int __of_attach_node_sysfs(struct device_node *np) struct property *pp; int rc; - if (!of_kset) + if (!IS_ENABLED(CONFIG_SYSFS) || !of_kset) return 0; np->kobj.kset = of_kset;