Nikolay Borisov 0d7718f666 ceph: fix error handling in ceph_read_iter
In case __ceph_do_getattr returns an error and the retry_op in
ceph_read_iter is not READ_INLINE, then it's possible to invoke
__free_page on a page which is NULL, this naturally leads to a crash.
This can happen when, for example, a process waiting on a MDS reply
receives sigterm.

Fix this by explicitly checking whether the page is set or not.

Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-10-15 23:28:07 +02:00
..
2016-06-01 10:31:50 +02:00
2016-06-24 23:49:03 -04:00
2016-07-28 02:55:39 +02:00
2012-05-16 14:28:27 -05:00
2013-12-31 20:32:01 +02:00
2016-10-03 16:13:49 +02:00
2013-12-31 20:32:01 +02:00
2016-05-26 01:15:31 +02:00
2016-07-28 03:00:44 +02:00
2016-07-28 03:00:45 +02:00