From 94d3b60ff6ac7a29b10f16a0a651b1360627f465 Mon Sep 17 00:00:00 2001
From: Mike Gilbert <floppym@gentoo.org>
Date: Wed, 27 Dec 2017 21:46:52 -0500
Subject: [PATCH] fileio: write_string_stream_ts: return errors from fputs and
 fputc

Ignoring errors from these functions may mask errors returned by the
kernel.

Fixes: https://github.com/systemd/systemd/issues/7744
---
 src/basic/fileio.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/basic/fileio.c b/src/basic/fileio.c
index 4e02d5b344..21ea24d90f 100644
--- a/src/basic/fileio.c
+++ b/src/basic/fileio.c
@@ -65,9 +65,12 @@ int write_string_stream_ts(
         assert(f);
         assert(line);
 
-        fputs(line, f);
+        if (fputs(line, f) == EOF)
+                return -errno;
+
         if (!(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n"))
-                fputc('\n', f);
+                if (fputc('\n', f) == EOF)
+                        return -errno;
 
         if (ts) {
                 struct timespec twice[2] = {*ts, *ts};