From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 7 Nov 2018 18:14:47 +0000 (+0100)
Subject: random-util: if zero random bytes are requested we can always fulfill the request
X-Git-Tag: v240~380^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=776cf7461fa54445a40df17c40cfd024b6f09578;p=platform%2Fupstream%2Fsystemd.git

random-util: if zero random bytes are requested we can always fulfill the request
---

diff --git a/src/basic/random-util.c b/src/basic/random-util.c
index 1c54b07..922b5a5 100644
--- a/src/basic/random-util.c
+++ b/src/basic/random-util.c
@@ -76,6 +76,9 @@ int genuine_random_bytes(void *p, size_t n, RandomFlags flags) {
          * the random pool is fully initialized or not.  Otherwise, it will return success if at least some random
          * bytes were successfully acquired, and an error if the kernel has no entropy whatsover for us. */
 
+        if (n == 0)
+                return 0;
+
         /* Use the getrandom() syscall unless we know we don't have it. */
         if (have_syscall != 0 && !HAS_FEATURE_MEMORY_SANITIZER) {