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H A Ddirect.cdiff be2fd1560eb57b7298aa3c258ddcca0d53ecdea3 Tue Aug 08 20:17:11 CDT 2023 Trond Myklebust <trond.myklebust@hammerspace.com> NFS: Fix a use after free in nfs_direct_join_group()

Be more careful when tearing down the subrequests of an O_DIRECT write
as part of a retransmission.

Reported-by: Chris Mason <clm@fb.com>
Fixes: ed5d588fe47f ("NFS: Try to join page groups before an O_DIRECT retransmission")
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>