From 57e46ac8f1de537e431d3ac69830edb39549241a Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Sun, 26 Jan 2014 16:01:17 +0000
Subject: [PATCH] spam.m4: Check that non-userv spam thresholds are
 well-formed.

Both are untrustworthy sources.
---
 spam.m4 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/spam.m4 b/spam.m4
index e480880..57b0c27 100644
--- a/spam.m4
+++ b/spam.m4
@@ -50,7 +50,9 @@ fetch_spam_limit:
 					@$domain/\
 					$sender_address} \
 			       nwildlsearch {CONF_userconf_dir/spam-limit} \
-			       {spam_limit=$value} \
+			       {${if match{$value}{\N^[0-9]+$\N} \
+				     {spam_limit=$value} \
+				     {}}} \
 			       {}}} \
 		     {}} \
 		${if exists {CONF_userconf_dir/spam-limit.userv} \
-- 
2.11.0