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NFSv4: Check for delegation validity in nfs_start_delegation_return_locked()

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[ Upstream commit 9e8f324bd44c1fe026b582b75213de4eccfa1163 ]

Check that the delegation is still attached after taking the spin lock
in nfs_start_delegation_return_locked().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust
2025-03-27 19:20:53 -04:00
committed by Greg Kroah-Hartman
parent 2371143e41
commit a81dd69f85
1 changed files with 2 additions and 1 deletions
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3
fs/nfs/delegation.c
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@@ -297,7 +297,8 @@ nfs_start_delegation_return_locked(struct nfs_inode *nfsi)
if (delegation == NULL)
goto out;
spin_lock(&delegation->lock);
if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) {
if (delegation->inode &&
!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) {
clear_bit(NFS_DELEGATION_RETURN_DELAYED, &delegation->flags);
/* Refcount matched in nfs_end_delegation_return() */
ret = nfs_get_delegation(delegation);