This is a note to let you know that I've just added the patch titled

acpi, nfit: fix register dimm error handling

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: acpi-nfit-fix-register-dimm-error-handling.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 23fbd7c70aec7600e3227eb24259fc55bf6e4881 Mon Sep 17 00:00:00 2001

From: Toshi Kani toshi.kani@hpe.com Date: Fri, 2 Feb 2018 14:00:36 -0700 Subject: acpi, nfit: fix register dimm error handling

From: Toshi Kani toshi.kani@hpe.com

commit 23fbd7c70aec7600e3227eb24259fc55bf6e4881 upstream.

A NULL pointer reference kernel bug was observed when acpi_nfit_add_dimm() called in acpi_nfit_register_dimms() failed. This error path does not set nfit_mem->nvdimm, but the 2nd list_for_each_entry() loop in the function assumes it's always set. Add a check to nfit_mem->nvdimm.

Fixes: ba9c8dd3c222 ("acpi, nfit: add dimm device notification support") Signed-off-by: Toshi Kani toshi.kani@hpe.com Cc: "Rafael J. Wysocki" rjw@rjwysocki.net Signed-off-by: Dan Williams dan.j.williams@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/acpi/nfit/core.c | 3 +++ 1 file changed, 3 insertions(+)

--- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1867,6 +1867,9 @@ static int acpi_nfit_register_dimms(stru struct kernfs_node *nfit_kernfs;

nvdimm = nfit_mem->nvdimm; + if (!nvdimm) + continue; + nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit"); if (nfit_kernfs) nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,

Patches currently in stable-queue which might be from toshi.kani@hpe.com are

queue-4.15/acpi-nfit-fix-register-dimm-error-handling.patch