From caf4802b0a64622092f673bac11964229f262273 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Tue, 16 Jun 2020 17:47:20 +0100
Subject: [PATCH] setup_utmp: add error check in case getpwuid fails.

Spotted by Coverity: if there is no password file entry associated
with our numeric uid, we'll press on anyway and dereference NULL.
---
 unix/uxpty.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/unix/uxpty.c b/unix/uxpty.c
index 721074fc..d7b8e177 100644
--- a/unix/uxpty.c
+++ b/unix/uxpty.c
@@ -206,6 +206,8 @@ static void setup_utmp(char *ttyname, char *location)
     struct timeval tv;
 
     pw = getpwuid(getuid());
+    if (!pw)
+        return; /* can't stamp utmp if we don't have a username */
     memset(&utmp_entry, 0, sizeof(utmp_entry));
     utmp_entry.ut_type = USER_PROCESS;
     utmp_entry.ut_pid = getpid();