From 5dc4fe1529bb9e1134245db505883364caac3280 Mon Sep 17 00:00:00 2001
From: Itamar Haber <itamar@redislabs.com>
Date: Fri, 2 Dec 2016 18:19:36 +0200
Subject: [PATCH] Verify pairs are provided after subcommands

Fixes https://github.com/antirez/redis/issues/3639
---
 src/t_zset.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/t_zset.c b/src/t_zset.c
index 8d905be0..d36fa30a 100644
--- a/src/t_zset.c
+++ b/src/t_zset.c
@@ -1521,7 +1521,7 @@ void zaddGenericCommand(client *c, int flags) {
     /* After the options, we expect to have an even number of args, since
      * we expect any number of score-element pairs. */
     elements = c->argc-scoreidx;
-    if (elements % 2) {
+    if (elements % 2 || !elements) {
         addReply(c,shared.syntaxerr);
         return;
     }