From 107d3801361b9f9084f78710178e683391f1d245 Mon Sep 17 00:00:00 2001
From: Jan Rybar <jrybar@redhat.com>
Date: Fri, 6 Jun 2025 13:25:55 +0200
Subject: [PATCH] Nested .policy files cause xml parsing overflow leading to
 crash

---
 src/polkitbackend/polkitbackendactionpool.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/polkitbackend/polkitbackendactionpool.c b/src/polkitbackend/polkitbackendactionpool.c
index 43f89cb..f4acca9 100644
--- a/src/polkitbackend/polkitbackendactionpool.c
+++ b/src/polkitbackend/polkitbackendactionpool.c
@@ -739,6 +739,12 @@ _start (void *data, const char *el, const char **attr)
   guint num_attr;
   ParserData *pd = data;
 
+  if (pd->stack_depth < 0 || pd->stack_depth >= PARSER_MAX_DEPTH)
+    {
+      g_warning ("XML parsing reached max depth?");
+      goto error;
+    }
+
   for (num_attr = 0; attr[num_attr] != NULL; num_attr++)
     ;
 
-- 
2.43.0