linux-kernel - [patch -resend] NVMe: handle allocation failure in nvme_map_user

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Message-ID: <20120627090623.GO31212@elgon.mountain>
Date:	Wed, 27 Jun 2012 12:06:23 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch -resend] 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@...cle.com>
---
Originally sent on Fri, 20 Jan 2012.

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index 38a2d06..b4d85b9 100644
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -1037,6 +1037,8 @@ 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) {
--
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