[PATCH 5.13 08/35] cifs: add missing parsing of backupuid

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Ronnie Sahlberg <lsahlber@redhat.com>

[ Upstream commit b946dbcfa4df80ec81b442964e07ad37000cc059 ]

We lost parsing of backupuid in the switch to new mount API.
Add it back.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Cc: <stable@vger.kernel.org> # v5.11+
Reported-by: Xiaoli Feng <xifeng@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/cifs/fs_context.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 553adfbcc22a..72742eb1df4a 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -918,6 +918,13 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 		ctx->cred_uid = uid;
 		ctx->cruid_specified = true;
 		break;
+	case Opt_backupuid:
+		uid = make_kuid(current_user_ns(), result.uint_32);
+		if (!uid_valid(uid))
+			goto cifs_parse_mount_err;
+		ctx->backupuid = uid;
+		ctx->backupuid_specified = true;
+		break;
 	case Opt_backupgid:
 		gid = make_kgid(current_user_ns(), result.uint_32);
 		if (!gid_valid(gid))
-- 
2.30.2