From 47436d30bb117d85149b1764733bd0ed8a53f0ce Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 7 Mar 2019 10:52:35 +0100
Subject: [PATCH] =?UTF-8?q?user-util:=20paranoia=20=E2=80=94=20add=20overf?=
 =?UTF-8?q?low=20check=20on=20ERANGE=20loop?=
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---
 src/basic/user-util.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/basic/user-util.c b/src/basic/user-util.c
index b8d1066929..4cf4c5a341 100644
--- a/src/basic/user-util.c
+++ b/src/basic/user-util.c
@@ -350,6 +350,9 @@ char* uid_to_name(uid_t uid) {
                         if (r != ERANGE)
                                 break;
 
+                        if (bufsize > LONG_MAX/2) /* overflow check */
+                                return NULL;
+
                         bufsize *= 2;
                 }
         }
@@ -391,6 +394,9 @@ char* gid_to_name(gid_t gid) {
                         if (r != ERANGE)
                                 break;
 
+                        if (bufsize > LONG_MAX/2) /* overflow check */
+                                return NULL;
+
                         bufsize *= 2;
                 }
         }