From: Christopher Faulet <cfaulet@haproxy.com>
Date: Fri, 18 Jul 2025 09:14:26 +0000 (+0200)
Subject: BUG/MINOR: hlua: Skip headers when a receive is performed on an HTTP applet
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4c6c6baaa96859a6a50dea0e6297f0be7751df6a;p=thirdparty%2Fhaproxy.git

BUG/MINOR: hlua: Skip headers when a receive is performed on an HTTP applet

When an HTTP applet tries to retrieve data, the request headers are still in
the buffer. But, instead of being silently removed, their size is removed
from the amount of data retrieved. When the request payload is fully
retrieved, it is not an issue. But it is a problem when a length is
specified. The data are shorten from the headers size.

So now, we take care to silently remove headers.

This patch must be backported to all stable versions.
---

diff --git a/src/hlua.c b/src/hlua.c
index e5f71c51d..3ee00e16c 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -5987,6 +5987,8 @@ __LJMP static int hlua_applet_http_recv_yield(lua_State *L, int status, lua_KCon
 			case HTX_BLK_DATA:
 				v = htx_get_blk_value(htx, blk);
 				luaL_addlstring(&luactx->b, v.ptr, vlen);
+				if (len > 0)
+					len -= vlen;
 				break;
 
 			case HTX_BLK_TLR:
@@ -6000,8 +6002,6 @@ __LJMP static int hlua_applet_http_recv_yield(lua_State *L, int status, lua_KCon
 
 		c_rew(req, vlen);
 		count -= vlen;
-		if (len > 0)
-			len -= vlen;
 		if (sz == vlen)
 			blk = htx_remove_blk(htx, blk);
 		else {