From: Christopher Faulet <cfaulet@haproxy.com>
Date: Wed, 22 Jul 2026 08:59:57 +0000 (+0200)
Subject: BUG/MEDIUM: htx: Don't reset flags when source must be preserved during transfer
X-Git-Url: https://git.kaiwu.me/?a=commitdiff_plain;h=04a39f5518e256d20e44e5abe0f8e8d3a7e573bf;p=haproxy.git

BUG/MEDIUM: htx: Don't reset flags when source must be preserved during transfer

When htx_xfer() is called with HTX_XFER_KEEP_SRC_BLKS flag, to preserve
blocks from the source HTX message, the source flags must not be reset at
the end of the transfer.

This bug can be triggered with L7-retries are configured with small
buffers. In that case, the HTX_FL_EOM flag is removed from the request
fowarded to the backend multiplexer.

This patch must be backported to 3.4.
---

diff --git a/src/htx.c b/src/htx.c
index 7143e3961..2a369f30f 100644
--- a/src/htx.c
+++ b/src/htx.c
@@ -893,7 +893,8 @@ size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int fla
 	/* Everything was copied, transfer terminal HTX flags too */
 	if (!blk) {
 		dst->flags |= (src->flags & (HTX_FL_EOM|HTX_FL_PARSING_ERROR|HTX_FL_PROCESSING_ERROR));
-		src->flags = 0;
+		if (!(flags & HTX_XFER_KEEP_SRC_BLKS))
+			src->flags = 0;
 	}
 
 	return ret;