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NFSv4: Ensure the delegation cred is pinned when we call delegreturn

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Ensure we don't release the delegation cred during the call to
nfs4_proc_delegreturn().

Fixes: ee05f45677 ("NFSv4: Fix races between open and delegreturn")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2020-02-13 14:51:07 -05:00 committed by Anna Schumaker
parent 8c75593c6e
commit 5d63944f82
1 changed files with 8 additions and 3 deletions
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11
fs/nfs/delegation.c
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@ -255,13 +255,18 @@ void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
{
const struct cred *cred;
int res = 0;
if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
res = nfs4_proc_delegreturn(inode,
delegation->cred,
if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
spin_lock(&delegation->lock);
cred = get_cred(delegation->cred);
spin_unlock(&delegation->lock);
res = nfs4_proc_delegreturn(inode, cred,
&delegation->stateid,
issync);
put_cred(cred);
}
return res;
}