From: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Date: Thu, 25 Mar 2021 12:50:13 +0000 (+0100)
Subject: basic/fileio: use malloc_usable_size() to use all allocated memory
X-Git-Tag: v248-2~10^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f1a8a66c35fbfe70d4f425e68becd8c1d1313464;p=thirdparty%2Fsystemd.git

basic/fileio: use malloc_usable_size() to use all allocated memory
---

diff --git a/src/basic/fileio.c b/src/basic/fileio.c
index 7c370d4fc3c..a158ab080d7 100644
--- a/src/basic/fileio.c
+++ b/src/basic/fileio.c
@@ -426,6 +426,7 @@ int read_full_virtual_file(const char *filename, char **ret_contents, size_t *re
                 buf = malloc(size + 1);
                 if (!buf)
                         return -ENOMEM;
+                size = malloc_usable_size(buf) - 1; /* Use a bigger allocation if we got it anyway */
 
                 for (;;) {
                         ssize_t k;