nfsd: Always lock state exclusively.

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commit feb9dad520 upstream.

It used to be the case that state had an rwlock that was locked for write
by downgrades, but for read for upgrades (opens). Well, the problem is
if there are two competing opens for the same state, they step on
each other toes potentially leading to leaking file descriptors
from the state structure, since access mode is a bitmap only set once.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Oleg Drokin 2016-06-14 23:28:04 -04:00 • committed by Greg Kroah-Hartman

parent 58e9e70ab9

commit 087f8fe007

2 changed files with 21 additions and 21 deletions

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40

fs/nfsd/nfs4state.c

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2

fs/nfsd/state.h

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