From ad3d5a8d4e90915bf16fc4b07995963f34e40d0a Mon Sep 17 00:00:00 2001
From: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Date: Fri, 12 Jun 2020 10:44:42 -0400
Subject: Fix crash with unbalanced [] in subject

Don't crash if there is no matching ] in the subject. The culprit:
https://lore.kernel.org/lkml/20200612142621.GA8009@lenoir

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
---
 b4/__init__.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/b4/__init__.py b/b4/__init__.py
index 641cc70..c85b85e 100644
--- a/b4/__init__.py
+++ b/b4/__init__.py
@@ -1382,6 +1382,8 @@ class LoreSubject:
         # Find all [foo] in the title
         while subject.find('[') == 0:
             matches = re.search(r'^\[([^\]]*)\]', subject)
+            if not matches:
+                break
             for chunk in matches.groups()[0].split():
                 # Remove any trailing commas or semicolons
                 chunk = chunk.strip(',;')
-- 
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