From 96d9651ece0aeb4045136c8c4e9f978eb1738334 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Sun, 3 Dec 2017 15:36:20 +0100
Subject: util.crand: Throw an error for sizes smaller than 1 byte

---
 util-src/crand.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'util-src')

diff --git a/util-src/crand.c b/util-src/crand.c
index cdc3c211..20871f3e 100644
--- a/util-src/crand.c
+++ b/util-src/crand.c
@@ -69,7 +69,9 @@ int getrandom(void *buf, size_t buflen, unsigned int flags) {
 int Lrandom(lua_State *L) {
 	char smallbuf[SMALLBUFSIZ];
 	char *buf = &smallbuf[0];
-	const size_t len = luaL_checkinteger(L, 1);
+	const lua_Integer l = luaL_checkinteger(L, 1);
+	const size_t len = l;
+	luaL_argcheck(L, l >= 0, 1, "must be > 0");
 
 	if(len > SMALLBUFSIZ) {
 		buf = lua_newuserdata(L, len);
-- 
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