nvdimm: Sanity check labeloff

This patch adds validation for the labeloff field in the indexes.

Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 1d28cd656536..1f5842509dbc 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -183,6 +183,13 @@ static int __nd_label_validate(struct nvdimm_drvdata *ndd)
                                         __le64_to_cpu(nsindex[i]->otheroff));
                         continue;
                 }
+                if (__le64_to_cpu(nsindex[i]->labeloff)
+                                != 2 * sizeof_namespace_index(ndd)) {
+                        dev_dbg(dev, "nsindex%d labeloff: %#llx invalid\n",
+                                        i, (unsigned long long)
+                                        __le64_to_cpu(nsindex[i]->labeloff));
+                        continue;
+                }
 
                 size = __le64_to_cpu(nsindex[i]->mysize);
                 if (size > sizeof_namespace_index(ndd)