linux-kernel - [PATCH 3.17 293/319] rbd: Fix error recovery in rbd_obj_read

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Message-Id: <20141112011041.316811681@linuxfoundation.org>
Date:	Wed, 12 Nov 2014 10:17:11 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Yehuda Sadeh <yehuda@...tank.com>,
	Sage Weil <sage@...tank.com>, ceph-devel@...r.kernel.org,
	Jan Kara <jack@...e.cz>, Ilya Dryomov <idryomov@...hat.com>
Subject: [PATCH 3.17 293/319] rbd: Fix error recovery in rbd_obj_read_sync()

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@...e.cz>

commit a8d4205623ae965e36c68629db306ca0695a2771 upstream.

When we fail to allocate page vector in rbd_obj_read_sync() we just
basically ignore the problem and continue which will result in an oops
later. Fix the problem by returning proper error.

CC: Yehuda Sadeh <yehuda@...tank.com>
CC: Sage Weil <sage@...tank.com>
CC: ceph-devel@...r.kernel.org
Coverity-id: 1226882
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Ilya Dryomov <idryomov@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/rbd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3382,7 +3382,7 @@ static int rbd_obj_read_sync(struct rbd_
 	page_count = (u32) calc_pages_for(offset, length);
 	pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
 	if (IS_ERR(pages))
-		ret = PTR_ERR(pages);
+		return PTR_ERR(pages);
 
 	ret = -ENOMEM;
 	obj_request = rbd_obj_request_create(object_name, offset, length,


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