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>

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index 6c0eb768562f25c53106cc3e14d928e8eab9a971..064e86a6bb4e429a2d0c0804155a38a9678f5c22 100644 (file)
--- 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) {