From 1cc511d7cb3b451c35bc511797e6e26f2f943c8e Mon Sep 17 00:00:00 2001
From: Binbin <binloveplay1314@qq.com>
Date: Sun, 9 Oct 2022 23:02:37 +0800
Subject: [PATCH] Fix TIME command microseconds overflow under 32-bits (#11368)

The old `server.unixtime*1000000` will overflow in 32-bits.
This was introduced in #10300 (not released).
---
 src/server.c                   | 2 +-
 tests/unit/introspection-2.tcl | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/server.c b/src/server.c
index 617a5e3bc..cb0faf888 100644
--- a/src/server.c
+++ b/src/server.c
@@ -4373,7 +4373,7 @@ void echoCommand(client *c) {
 void timeCommand(client *c) {
     addReplyArrayLen(c,2);
     addReplyBulkLongLong(c, server.unixtime);
-    addReplyBulkLongLong(c, server.ustime-server.unixtime*1000000);
+    addReplyBulkLongLong(c, server.ustime-((long long)server.unixtime)*1000000);
 }
 
 typedef struct replyFlagNames {
diff --git a/tests/unit/introspection-2.tcl b/tests/unit/introspection-2.tcl
index dab8008e8..9576c39ab 100644
--- a/tests/unit/introspection-2.tcl
+++ b/tests/unit/introspection-2.tcl
@@ -3,6 +3,13 @@ proc cmdstat {cmd} {
 }
 
 start_server {tags {"introspection"}} {
+    test {The microsecond part of the TIME command will not overflow} {
+        set now [r time]
+        set microseconds [lindex $now 1]
+        assert_morethan $microseconds 0
+        assert_lessthan $microseconds 1000000
+    }
+
     test {TTL, TYPE and EXISTS do not alter the last access time of a key} {
         r set foo bar
         after 3000