From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Thu, 29 Jul 2021 16:35:00 +0000 (+0100)
Subject: [Minor] Fix content length calculations
X-Git-Tag: 3.0~76
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=47e8abad8456fd3cd46d98241c6bc9ca71cf9368;p=rspamd.git

[Minor] Fix content length calculations
---

diff --git a/src/lua/lua_html.cxx b/src/lua/lua_html.cxx
index 9a562d2fa..2b0f63c02 100644
--- a/src/lua/lua_html.cxx
+++ b/src/lua/lua_html.cxx
@@ -580,8 +580,10 @@ lua_html_tag_get_content (lua_State *L)
 
 	if (ltag) {
 		auto clen = ltag->tag->get_content_length();
-		if (ltag->html && clen &&
-				ltag->html->parsed.size() >= ltag->tag->content_offset + clen) {
+		if (ltag->html && clen && ltag->html->parsed.size() > ltag->tag->content_offset) {
+			if (ltag->html->parsed.size() - ltag->tag->content_offset < clen) {
+				clen = ltag->html->parsed.size() - ltag->tag->content_offset;
+			}
 			t = static_cast<rspamd_lua_text *>(lua_newuserdata(L, sizeof(*t)));
 			rspamd_lua_setclass (L, "rspamd{text}", -1);
 			t->start = reinterpret_cast<const char *>(ltag->html->parsed.data()) +