From 0853e5d9d7bd15fc7782b111dcf9815d25c6d031 Mon Sep 17 00:00:00 2001
From: Garret Rieger <grieger@google.com>
Date: Mon, 12 Dec 2022 19:43:31 +0000
Subject: [PATCH] [subset] if table dependencies can't be resolved fail the
 subset.

Avoids getting stuck in an infinite loop.
---
 src/hb-subset.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index f169314b9..e4f164aea 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -604,6 +604,12 @@ hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan)
         success = _subset_table (plan, buf, tag);
         if (unlikely (!success)) goto end;
       }
+      if (revisit_set == revisit_temp) {
+        DEBUG_MSG (SUBSET, nullptr, "Table dependencies unable to be satisfied. Subset failed.");
+        success = false;
+        goto end;
+      }
+
       revisit_set = revisit_temp;
     }
     offset += num_tables;