From b1cc5567b2e083e1eeec2fa480839d17c32ccd1e Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Wed, 27 Jul 2022 18:06:55 -0700
Subject: [PATCH] Fix heap buffer overflow in
 yaml_emitter_emit_flow_mapping_key

---
 src/emitter.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/emitter.rs b/src/emitter.rs
index c4e7d76..1388a69 100644
--- a/src/emitter.rs
+++ b/src/emitter.rs
@@ -722,6 +722,9 @@ unsafe fn yaml_emitter_emit_flow_mapping_key(
         *fresh18 += 1;
     }
     if (*event).type_ == YAML_MAPPING_END_EVENT {
+        if STACK_EMPTY!((*emitter).indents) {
+            return FAIL;
+        }
         let fresh19 = addr_of_mut!((*emitter).flow_level);
         *fresh19 -= 1;
         (*emitter).indent = POP!((*emitter).indents);