[PATCH 6.18.y 3/3] NFSD: map fh_verify() status codes for NFS_ACLv2 replies

[Sasha Levin <sashal@kernel.org>]

From: Chuck Lever <cel@kernel.org>

[ Upstream commit ccfc4db5ab740175b9958ea0cf5986957bf4e659 ]

The NFS_ACL v2 protocol shares its status code space with NFSv2,
which has no NFSERR_BADHANDLE and no NFSERR_NOFILEHANDLE. An
NFS_ACLv2 GETACL, SETACL, GETATTR, or ACCESS request that carries a
malformed or empty file handle gets a reply with status 10001 or
10020, values the client cannot interpret.

Commit 1459ad57673b ("nfsd: Move error code mapping to per-version
proc code.") removed the version check from fh_verify() that turned
those codes into NFSERR_STALE for any version 2 program. The NFSv2
procedures gained nfsd_map_status() in exchange, but the NFS_ACL v2
procedures did not, so the unmapped status reaches the encoder.

Add the same mapping to the NFS_ACL v2 procedures.

Fixes: 1459ad57673b ("nfsd: Move error code mapping to per-version proc code.")
Cc: stable@vger.kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260916004240.141975-1-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfsd/nfs2acl.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c
index 537097ce8c767..87269be93d0f6 100644
--- a/fs/nfsd/nfs2acl.c
+++ b/fs/nfsd/nfs2acl.c
@@ -57,6 +57,20 @@ static const struct nfsd_access_maps nfsd2_access_maps = {
 	.other		= nfsd2_otheraccess,
 };
 
+static __be32 nfsacld_map_status(__be32 status)
+{
+	switch (status) {
+	case nfserr_nofilehandle:
+	case nfserr_badhandle:
+		status = nfserr_stale;
+		break;
+	case nfserr_wrongsec:
+		status = nfserr_acces;
+		break;
+	}
+	return status;
+}
+
 /*
  * NULL call.
  */
@@ -121,6 +135,7 @@ static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp)
 
 	/* resp->acl_{access,default} are released in nfssvc_release_getacl. */
 out:
+	resp->status = nfsacld_map_status(resp->status);
 	return rpc_success;
 
 fail:
@@ -179,6 +194,7 @@ static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp)
 
 out:
 	/* argp->acl_{access,default} are released in nfsaclsvc_release_setacl. */
+	resp->status = nfsacld_map_status(resp->status);
 	return rpc_success;
 
 out_drop_lock:
@@ -205,6 +221,7 @@ static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
 		goto out;
 	resp->status = fh_getattr(&resp->fh, &resp->stat);
 out:
+	resp->status = nfsacld_map_status(resp->status);
 	return rpc_success;
 }
 
@@ -229,6 +246,7 @@ static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
 		goto out;
 	resp->status = fh_getattr(&resp->fh, &resp->stat);
 out:
+	resp->status = nfsacld_map_status(resp->status);
 	return rpc_success;
 }
 
-- 
2.53.0