nfsd: Fix another OPEN stateid race

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commit d8a1a00055 upstream.

If nfsd4_process_open2() is initialising a new stateid, and yet the
call to nfs4_get_vfs_file() fails for some reason, then we must
declare the stateid closed, and unhash it before dropping the mutex.

Right now, we unhash the stateid after dropping the mutex, and without
changing the stateid type, meaning that another OPEN could theoretically
look it up and attempt to use it.

Reported-by: Andrew W Elble <aweits@rit.edu>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Trond Myklebust 2017-11-03 08:00:11 -04:00 • committed by Greg Kroah-Hartman

parent db77ab54a5

commit 73cfeab675

1 changed files with 13 additions and 15 deletions

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fs/nfsd/nfs4state.c

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