[PATCH 5.10.y] nfsd: fix nfsd_file leak on inter-server COPY setup failure

[Sasha Levin <sashal@kernel.org>]

From: Jeff Layton <jlayton@kernel.org>

[ Upstream commit 88a76145451d703eedd867b5989bf73d17340399 ]

When nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns
nfserr_offload_denied directly, bypassing the out: label where
release_copy_files() would drop the nf_dst reference taken by
nfs4_preprocess_stateid_op(). Each failed inter-server COPY
leaks one nfsd_file, pinning file/inode/dentry/vfsmount.

Fix by setting status and jumping to out: instead of returning
directly.

Fixes: ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy")
Cc: stable@vger.kernel.org
Assisted-by: kres:claude-opus-4-7
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260531-nfsd-testing-v1-3-7bfa481b0540@kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[ adjusted cleanup paths to omit unavailable trace_nfsd_copy_*() calls ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfsd/nfs4proc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index a4c7cab1679bd..39954506fd157 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1776,12 +1776,14 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			goto out;
 		}
 		status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
-		if (status)
-			return nfserr_offload_denied;
+		if (status) {
+			status = nfserr_offload_denied;
+			goto out;
+		}
 	} else {
 		status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
 		if (status)
-			return status;
+			goto out;
 	}
 
 	memcpy(&copy->fh, &cstate->current_fh.fh_handle,
-- 
2.53.0