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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>
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@ -1272,7 +1272,8 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
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statret = __ceph_do_getattr(inode, page,
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CEPH_STAT_CAP_INLINE_DATA, !!page);
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if (statret < 0) {
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__free_page(page);
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if (page)
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__free_page(page);
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if (statret == -ENODATA) {
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BUG_ON(retry_op != READ_INLINE);
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goto again;
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