From d5a5c4935769fe95cff6d909948908a2446ba80e Mon Sep 17 00:00:00 2001
From: rick2600 <ricks2600@gmail.com>
Date: Thu, 14 Apr 2022 16:20:04 -0300
Subject: [PATCH] #951 - fix unchecked count in cfun_buffer_new_filled

---
 src/core/buffer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/buffer.c b/src/core/buffer.c
index 79bde4d5..64ef6c89 100644
--- a/src/core/buffer.c
+++ b/src/core/buffer.c
@@ -178,12 +178,13 @@ JANET_CORE_FN(cfun_buffer_new_filled,
               "Returns the new buffer.") {
     janet_arity(argc, 1, 2);
     int32_t count = janet_getinteger(argv, 0);
+    if (count < 0) count = 0;
     int32_t byte = 0;
     if (argc == 2) {
         byte = janet_getinteger(argv, 1) & 0xFF;
     }
     JanetBuffer *buffer = janet_buffer(count);
-    if (buffer->data)
+    if (buffer->data && count > 0)
         memset(buffer->data, byte, count);
     buffer->count = count;
     return janet_wrap_buffer(buffer);