From efa57159ddee3f0fbd0261cb7a6a6a16765fa919 Mon Sep 17 00:00:00 2001
From: Gerry Garvey <ggarvey@gmx.com>
Date: Sat, 1 Aug 2020 14:05:39 +0100
Subject: [PATCH] Handle return value from getrandom()

---
 arc4random.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/arc4random.c b/arc4random.c
index 8729f6b9..9a00ea2c 100644
--- a/arc4random.c
+++ b/arc4random.c
@@ -176,25 +176,14 @@ static int
 arc4_seed_getrandom(void)
 {
 	unsigned char buf[ADD_ENTROPY];
-	size_t len, n;
-	unsigned i;
-	int any_set;
-
-	memset(buf, 0, sizeof(buf));
+	size_t len;
+	ssize_t n = 0;
 
 	for (len = 0; len < sizeof(buf); len += n) {
-		n = sizeof(buf) - len;
-
-		if (0 == getrandom(&buf[len], n, 0))
+		n = getrandom(&buf[len], sizeof(buf) - len, 0);
+		if (n < 0)
 			return -1;
 	}
-	/* make sure that the buffer actually got set. */
-	for (i=0,any_set=0; i<sizeof(buf); ++i) {
-		any_set |= buf[i];
-	}
-	if (!any_set)
-		return -1;
-
 	arc4_addrandom(buf, sizeof(buf));
 	evutil_memclear_(buf, sizeof(buf));
 	return 0;
-- 
2.40.0