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Nikolay Borisov authored
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>
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