From bec26152b7cfe3c178b6bccf99eb87f64dd808b4 Mon Sep 17 00:00:00 2001
From: Richard Russon <rich@flatcap.org>
Date: Mon, 29 Apr 2019 14:57:30 +0100
Subject: [PATCH] libemail: fix rfc2231 code for degenerate cases

---
 email/rfc2231.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/email/rfc2231.c b/email/rfc2231.c
index c4f25b376..363b7d966 100644
--- a/email/rfc2231.c
+++ b/email/rfc2231.c
@@ -322,6 +322,9 @@ void rfc2231_decode_parameters(struct ParameterList *p)
  */
 int rfc2231_encode_string(char **pd)
 {
+  if (!pd || !*pd)
+    return 0;
+
   int ext = 0;
   bool encode = false;
   char *charset = NULL, *s = NULL, *t = NULL, *e = NULL, *d = NULL;
-- 
2.40.0