From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 20 Jan 2012 12:55:30 +0000 (-0500)
Subject: NVMe: handle allocation failure in nvme_map_user_pages()
X-Git-Tag: firefly_0821_release~3680^2~2014^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=22fff826e715e9727d3c7a69f15e602a9801b673;p=firefly-linux-kernel-4.4.55.git

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 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) {