[PATCH 2/4] fs/resctrl: Free mon_data structures on rdt_get_tree() failure

[Tony Luck]

If mkdir_mondata_all() succeeds but a subsequent call in rdt_get_tree()
fails, the mon_data structures allocated by mon_get_kn_priv() are
leaked. Add mon_put_kn_priv() to the out_mondata error path to free
them.

mon_get_kn_priv() and mon_put_kn_priv() moved so defined before used.

Fixes: ee4f0ec938ad ("fs/resctrl: Simplify allocation of mon_data structures")
Reported-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Assisted-by: GitHub_Copilot_CLI:claude-sonnet-4.6
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
 fs/resctrl/rdtgroup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index a6376a3fc4c3..0db1a92aefbe 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -3067,8 +3067,10 @@ static int rdt_get_tree(struct fs_context *fc)
 out_psl:
 	rdt_pseudo_lock_release();
 out_mondata:
-	if (resctrl_arch_mon_capable())
+	if (resctrl_arch_mon_capable()) {
+		mon_put_kn_priv();
 		kernfs_remove(kn_mondata);
+	}
 out_mongrp:
 	if (resctrl_arch_mon_capable()) {
 		rdtgroup_unassign_cntrs(&rdtgroup_default);
-- 
2.54.0