From: Christopher Faulet <cfaulet@haproxy.com>
Date: Wed, 28 Jan 2026 14:02:20 +0000 (+0100)
Subject: MINOR: buffers: Swap buffers of same size only
X-Git-Tag: v3.4-dev5~48
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fae478dae56b193a5aef2e0964501f64697ba11d;p=thirdparty%2Fhaproxy.git

MINOR: buffers: Swap buffers of same size only

In b_xfer(), we now take care to swap buffers of the same size only. For
now, it is always the case. But that will change.
---

diff --git a/src/buf.c b/src/buf.c
index afe33110b..19f38e504 100644
--- a/src/buf.c
+++ b/src/buf.c
@@ -348,7 +348,7 @@ size_t b_xfer(struct buffer *dst, struct buffer *src, size_t count)
 
 	if (ret > count)
 		ret = count;
-	else if (!b_data(dst)) {
+	else if (!b_data(dst) && b_size(dst) == b_size(src)) {
 		/* zero copy is possible by just swapping buffers */
 		struct buffer tmp = *dst;
 		*dst = *src;