nfsd: Detect unhashed stids in nfsd4_verify_open_stid()

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The state of the stid is guaranteed by 2 locks:
- The nfs4_client 'cl_lock' spinlock
- The nfs4_ol_stateid 'st_mutex' mutex

so it is quite possible for the stid to be unhashed after lookup,
but before calling nfsd4_lock_ol_stateid(). So we do need to check
for a zero value for 'sc_type' in nfsd4_verify_open_stid().

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Checuk Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org
Fixes: 659aefb68e "nfsd: Ensure we don't recognise lock stateids..."
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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Trond Myklebust 2018-01-12 17:42:30 -05:00 • committed by J. Bruce Fields

parent d0945caafc

commit 4f1764172a

1 changed files with 1 additions and 0 deletions

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fs/nfsd/nfs4state.c

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