From aff07bc63d030438e2f1bb4178f0d02c5b8a2c83 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Thu, 26 Jan 2017 23:18:12 +0100
Subject: Make app_lua_mark() stupidity resistant

---
 hex.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hex.c b/hex.c
index ea09f04..ade7d32 100644
--- a/hex.c
+++ b/hex.c
@@ -988,6 +988,10 @@ app_lua_chunk_newindex (lua_State *L)
 static void
 app_lua_mark (int64_t offset, int64_t len, const char *desc)
 {
+	// That would cause stupid entries, making trouble in marks_by_offset
+	if (len <= 0)
+		return;
+
 	ARRAY_RESERVE (g_ctx.marks, 1);
 	g_ctx.marks[g_ctx.marks_len++] =
 		(struct mark) { offset, len, g_ctx.mark_strings.len };
-- 
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