From: Trond Myklebust trond.myklebust@hammerspace.com
[ 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 55cfa1c4e0a65..bbd582d8a7dc9 100644 --- a/fs/nfs/delegation.c +++ b/fs/nfs/delegation.c @@ -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);