NVMe: handle allocation failure in nvme_map_user_pages()

We should return here and avoid a NULL dereference.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index 6c0eb768562f..064e86a6bb4e 100644
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -1044,6 +1044,8 @@ static struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
         offset = offset_in_page(addr);
         count = DIV_ROUND_UP(offset + length, PAGE_SIZE);
         pages = kcalloc(count, sizeof(*pages), GFP_KERNEL);
+        if (!pages)
+                return ERR_PTR(-ENOMEM);
 
         err = get_user_pages_fast(addr, count, 1, pages);
         if (err < count) {