From: xquery <jim@webcomposite.com>
Date: Mon, 8 Jun 2020 11:25:56 +0000 (+0200)
Subject: multi: add defensive check on data->multi->num_alive
X-Git-Tag: curl-7_71_0~41
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a35580e210df6a0548c114665f201ecd759eadd;p=thirdparty%2Fcurl.git

multi: add defensive check on data->multi->num_alive

Closes #5540
---

diff --git a/lib/multi.c b/lib/multi.c
index a614929eca..d20b33dbce 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -168,9 +168,11 @@ static void mstate(struct Curl_easy *data, CURLMstate state
   }
 #endif
 
-  if(state == CURLM_STATE_COMPLETED)
+  if(state == CURLM_STATE_COMPLETED) {
     /* changing to COMPLETED means there's one less easy handle 'alive' */
+    DEBUGASSERT(data->multi->num_alive > 0);
     data->multi->num_alive--;
+  }
 
   /* if this state has an init-function, run it */
   if(finit[state])