From 54136316b31afbee3330fcdccfba5380a9a12cc8 Mon Sep 17 00:00:00 2001
From: Pei-Hsuan Hung <afcidk@gmail.com>
Date: Mon, 14 Jun 2021 10:32:44 +0800
Subject: [PATCH] Fix potential fault at createDoubleObject

Resolves #963.

Add additional check to `hi_malloc` for `r->str` when len+1 equals to 0.
---
 hiredis.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hiredis.c b/hiredis.c
index 58251742c..933282432 100644
--- a/hiredis.c
+++ b/hiredis.c
@@ -231,6 +231,11 @@ static void *createDoubleObject(const redisReadTask *task, double value, char *s
         freeReplyObject(r);
         return NULL;
     }
+    else if (len+1 == 0) {
+        hi_free(r->str);
+        freeReplyObject(r);
+        return NULL;
+    }
 
     /* The double reply also has the original protocol string representing a
      * double as a null terminated string. This way the caller does not need