From fc3a3be33716675a4169ab4265a28250764b283d Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Wed, 18 Nov 2009 01:36:30 -0800
Subject: [PATCH] linke_message: Avoid segfault when In-Reply-to header is
 empty.

This was recently introduced in commit:

	64c03ae97f2f5294c60ef25d7f41849864e6ebd3

which was adding extra checks to avoid adding a self-referencing
message.

How many times am I going to fix a dumb regression like this and say
"we really need a test suite" before I actually sit down and write the
test suite?
---
 lib/database.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/database.cc b/lib/database.cc
index 65478b8a..ce9a86bf 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -726,7 +726,8 @@ _notmuch_database_link_message_to_parents (notmuch_database_t *notmuch,
 
     /* Carefully avoid adding any self-referential in-reply-to term. */
     in_reply_to_message_id = _parse_message_id (message, in_reply_to, NULL);
-    if (strcmp (in_reply_to_message_id,
+    if (in_reply_to_message_id &&
+	strcmp (in_reply_to_message_id,
 		notmuch_message_get_message_id (message)))
     {
 	_notmuch_message_add_term (message, "replyto",