[PATCH AUTOSEL 6.14 012/642] NFSv4: Check for delegation validity in nfs_start_delegation_return_locked()

Sasha Levin
2025-05-05T22:14:39Z

[ 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>
---
fs/nfs/delegation.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 325ba0663a6de..8bdbc4dca89ca 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -307,7 +307,8 @@ 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);
--
2.39.5