From 7aa75c7b5ef4146e75539bcc432b074b9c9661af Mon Sep 17 00:00:00 2001
From: Christopher Ng <chrng8@gmail.com>
Date: Tue, 17 Aug 2021 17:57:21 +0000
Subject: [PATCH] Hash cache key

Signed-off-by: Christopher Ng <chrng8@gmail.com>
---
 lib/private/User/Manager.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index 59c007b6b59a3..fca642473d9b1 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -159,7 +159,7 @@ public function get($uid) {
 			return $this->cachedUsers[$uid];
 		}
 
-		$cachedBackend = $this->cache->get($uid);
+		$cachedBackend = $this->cache->get(sha1($uid));
 		if ($cachedBackend !== null && isset($this->backends[$cachedBackend])) {
 			// Cache has the info of the user backend already, so ask that one directly
 			$backend = $this->backends[$cachedBackend];
@@ -175,7 +175,8 @@ public function get($uid) {
 			}
 
 			if ($backend->userExists($uid)) {
-				$this->cache->set($uid, $i, 300);
+				// Hash $uid to ensure that only valid characters are used for the cache key
+				$this->cache->set(sha1($uid), $i, 300);
 				return $this->getUserObject($uid, $backend);
 			}
 		}