From d5b81e8966d71ac2f13465fa308c9910b0e31992 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Tue, 19 Jan 2021 18:35:41 +0100
Subject: check_curl: fixed a potential buffer overflow in url buffer


diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index ef77918..a3f63f1 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -1041,7 +1041,7 @@ redir (curlhelp_write_curlbuf* header_buf)
     const UriPathSegmentA* p = uri.pathHead;
     for (; p; p = p->next) {
       strncat (new_url, "/", DEFAULT_BUFFER_SIZE);
-      strncat (new_url, uri_string (p->text, buf, DEFAULT_BUFFER_SIZE), DEFAULT_BUFFER_SIZE);
+      strncat (new_url, uri_string (p->text, buf, DEFAULT_BUFFER_SIZE), DEFAULT_BUFFER_SIZE-1);
     }
   }
 
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