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pNFS/flexfiles: Check the layout validity in ff_layout_mirror_prepare…
…_stats commit e1c6cfb upstream. Ensure that we check the layout pointer and validity after dereferencing it in ff_layout_mirror_prepare_stats. Fixes: 08e2e5b ("pNFS/flexfiles: Clean up layoutstats") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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