From 32defc31970ddd0e5da14481b88f06428630bdb4 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 24 Jun 2020 15:23:19 +0200
Subject: escape: zero length input should return a zero length output

Regression added in 7.71.0.

Fixes #5601
Reported-by: Kristoffer Gleditsch
Closes #5602
---
 lib/escape.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/escape.c b/lib/escape.c
index f3c558ed0..26d44df7b 100644
--- a/lib/escape.c
+++ b/lib/escape.c
@@ -89,6 +89,9 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
   Curl_dyn_init(&d, CURL_MAX_INPUT_LENGTH);
 
   length = (inlength?(size_t)inlength:strlen(string));
+  if(!length)
+    return strdup("");
+
   while(length--) {
     unsigned char in = *string; /* we need to treat the characters unsigned */
 
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