This is a note to let you know that I've just added the patch titled
libnvdimm, namespace: fix btt claim class crash
to the 4.13-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:
libnvdimm-namespace-fix-btt-claim-class-crash.patch
and it can be found in the queue-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 33a56086712561b8b9cdc881e0317f4c36861f72 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Date: Mon, 18 Sep 2017 14:48:58 -0700
Subject: libnvdimm, namespace: fix btt claim class crash
From: Dan Williams <dan.j.williams@xxxxxxxxx>
commit 33a56086712561b8b9cdc881e0317f4c36861f72 upstream.
Maurice reports:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
IP: holder_class_store+0x253/0x2b0 [libnvdimm]
...while trying to reconfigure an NVDIMM-N namespace into 'sector' /
'btt' mode. The crash points to this line:
(gdb) li *(holder_class_store+0x253)
0x7773 is in holder_class_store (drivers/nvdimm/namespace_devs.c:1420).
1415 for (i = 0; i < nd_region->ndr_mappings; i++) {
1416 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1417 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1418 struct nd_namespace_index *nsindex;
1419
1420 nsindex = to_namespace_index(ndd, ndd->ns_current);
...where we are failing because ndd is NULL due to NVDIMM-N dimms not
supporting labels.
Long story short, default to the BTTv1 format in the label-less /
NVDIMM-N case.
Fixes: 14e494542636 ("libnvdimm, btt: BTT updates for UEFI 2.7 format")
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Reported-by: Maurice A. Saldivar <maurice.a.saldivar@xxxxxxx>
Tested-by: Maurice A. Saldivar <maurice.a.saldivar@xxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/nvdimm/namespace_devs.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1417,6 +1417,15 @@ static int btt_claim_class(struct device
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_namespace_index *nsindex;
+ /*
+ * If any of the DIMMs do not support labels the only
+ * possible BTT format is v1.
+ */
+ if (!ndd) {
+ loop_bitmask = 0;
+ break;
+ }
+
nsindex = to_namespace_index(ndd, ndd->ns_current);
if (nsindex == NULL)
loop_bitmask |= 1;
Patches currently in stable-queue which might be from dan.j.williams@xxxxxxxxx are
queue-4.13/brd-fix-overflow-in-__brd_direct_access.patch
queue-4.13/dax-remove-the-pmem_dax_ops-flush-abstraction.patch
queue-4.13/libnvdimm-namespace-fix-btt-claim-class-crash.patch
queue-4.13/genirq-fix-cpumask-check-in-__irq_startup_managed.patch