From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Mon, 26 Apr 2021 15:48:20 +0000 (+0100)
Subject: [Minor] Do not decompress empty stream as zst behaves badly in this case
X-Git-Tag: 3.0~461
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f1dd413d7a092c432e032aac8c3dd46eee332aa1;p=thirdparty%2Frspamd.git

[Minor] Do not decompress empty stream as zst behaves badly in this case
---

diff --git a/src/lua/lua_compress.c b/src/lua/lua_compress.c
index 8d2a7e70b0..5bebd0e0d9 100644
--- a/src/lua/lua_compress.c
+++ b/src/lua/lua_compress.c
@@ -545,6 +545,10 @@ lua_zstd_decompress_stream (lua_State *L)
 	if (ctx && t) {
 		gsize dlen = 0;
 
+		if (t->len == 0) {
+			return lua_zstd_push_error (L, ZSTD_error_init_missing);
+		}
+
 		inb.size = t->len;
 		inb.pos = 0;
 		inb.src = (const void*)t->start;