From fb96e44d2bcab18291197b465e97f5acc9a813a2 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 7 Aug 2020 00:15:12 +0200
Subject: smtp_parse_address: handle blank input string properly

---
 lib/smtp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/smtp.c b/lib/smtp.c
index 685513b3b..aea41bb4e 100644
--- a/lib/smtp.c
+++ b/lib/smtp.c
@@ -1760,8 +1760,10 @@ static CURLcode smtp_parse_address(struct connectdata *conn, const char *fqma,
     return CURLE_OUT_OF_MEMORY;
 
   length = strlen(dup);
-  if(dup[length - 1] == '>')
-    dup[length - 1] = '\0';
+  if(length) {
+    if(dup[length - 1] == '>')
+      dup[length - 1] = '\0';
+  }
 
   /* Extract the host name from the address (if we can) */
   host->name = strpbrk(dup, "@");
-- 
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