rbd: Fix error recovery in rbd_obj_read_sync()

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@inktank.com>
CC: Sage Weil <sage@inktank.com>
CC: ceph-devel@vger.kernel.org
CC: stable@vger.kernel.org
Coverity-id: 1226882
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index be8d44a..27b71a0 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3533,7 +3533,7 @@ static int rbd_obj_read_sync(struct rbd_device *rbd_dev,
        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,