https://bugs.gentoo.org/855395
https://marc.info/?l=oss-security&m=165657063921408&w=2
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commitdiff;h=7b1db7192e6e4d0cfc439b23b13831837c85bc21

From 7b1db7192e6e4d0cfc439b23b13831837c85bc21 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 14 Jun 2022 11:33:27 +0200
Subject: [PATCH] g10: Fix garbled status messages in NOTATION_DATA

* g10/cpr.c (write_status_text_and_buffer): Fix off-by-one
--

Depending on the escaping and line wrapping the computed remaining
buffer length could be wrong.  Fixed by always using a break to
terminate the escape detection loop.  Might have happened for all
status lines which may wrap.

GnuPG-bug-id: T6027
--- a/g10/cpr.c
+++ b/g10/cpr.c
@@ -328,20 +328,15 @@ write_status_text_and_buffer (int no, const char *string,
             }
           first = 0;
         }
-      for (esc=0, s=buffer, n=len; n && !esc; s++, n--)
+      for (esc=0, s=buffer, n=len; n; s++, n--)
         {
           if (*s == '%' || *(const byte*)s <= lower_limit
               || *(const byte*)s == 127 )
             esc = 1;
           if (wrap && ++count > wrap)
-            {
-              dowrap=1;
-              break;
-            }
-        }
-      if (esc)
-        {
-          s--; n++;
+            dowrap=1;
+          if (esc || dowrap)
+            break;
         }
       if (s != buffer)
         es_fwrite (buffer, s-buffer, 1, statusfp);