From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 24 Jun 2020 13:23:19 +0000 (+0200)
Subject: escape: zero length input should return a zero length output
X-Git-Tag: curl-7_71_1~26
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=32defc31970ddd0e5da14481b88f06428630bdb4;p=thirdparty%2Fcurl.git

escape: zero length input should return a zero length output

Regression added in 7.71.0.

Fixes #5601
Reported-by: Kristoffer Gleditsch
Closes #5602
---

diff --git a/lib/escape.c b/lib/escape.c
index f3c558ed0e..26d44df7b6 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 */