From 26cbebfcfd0051bdb17757a96df7509f96fefeab Mon Sep 17 00:00:00 2001
From: Cloud Wu <cloudwu@gmail.com>
Date: Wed, 21 Oct 2015 12:58:57 +0800
Subject: [PATCH] verify callback overflow

---
 lualib-src/sproto/sproto.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lualib-src/sproto/sproto.c b/lualib-src/sproto/sproto.c
index b5d61ea6..ec77441b 100644
--- a/lualib-src/sproto/sproto.c
+++ b/lualib-src/sproto/sproto.c
@@ -677,6 +677,7 @@ encode_object(sproto_callback cb, struct sproto_arg *args, uint8_t *data, int si
 	args->value = data+SIZEOF_LENGTH;
 	args->length = size-SIZEOF_LENGTH;
 	sz = cb(args);
+	assert(sz <= size-SIZEOF_LENGTH);	// verify buffer overflow
 	if (sz <= 0)
 		return sz;
 	if (args->type == SPROTO_TSTRING) {