From e0567bc8adfe027052b78b40efb57d543924f138 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 21 Jan 2020 10:49:58 +0100
Subject: [PATCH] journal: don't use startswith() on something that is not a
 NUL-terminated string

Otherwise we might access memory coming after it that is not valid or
allocated.

Fixes: #14114
---
 src/journal/sd-journal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 358f2fd738..837aecdf60 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -161,7 +161,7 @@ static int match_is_valid(const void *data, size_t size) {
         if (size < 2)
                 return false;
 
-        if (startswith(data, "__"))
+        if (((char*) data)[0] == '_' && ((char*) data)[1] == '_')
                 return false;
 
         b = data;