From: Libor Peltan <libor.peltan@nic.cz>
Date: Thu, 11 Nov 2021 17:25:32 +0000 (+0100)
Subject: xdp-tcp: bugfix 1
X-Git-Tag: v3.3.dev~171^2~26
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ff42ad0105b8802bd04a79fc22792dbfeae99f5;p=thirdparty%2Fknot-dns.git

xdp-tcp: bugfix 1
---

diff --git a/src/libknot/xdp/tcp.c b/src/libknot/xdp/tcp.c
index 0d698ce7ba..e65c0cee95 100644
--- a/src/libknot/xdp/tcp.c
+++ b/src/libknot/xdp/tcp.c
@@ -605,6 +605,10 @@ void sweep_reset(knot_tcp_table_t *tcp_table, knot_tcp_relay_t *rl,
 	}
 }
 
+#ifndef SSIZE_MAX
+#define SSIZE_MAX ((SIZE_MAX - 2) / 2)
+#endif
+
 _public_
 int knot_tcp_sweep(knot_tcp_table_t *tcp_table,
                    uint32_t close_timeout, uint32_t reset_timeout,
@@ -622,8 +626,8 @@ int knot_tcp_sweep(knot_tcp_table_t *tcp_table,
 	knot_tcp_relay_t *rl = relays, *rl_max = rl + max_relays;
 
 	ssize_t free_conns =  (ssize_t)tcp_table->usage - limit_n_conn;
-	ssize_t free_inbuf =  (ssize_t)tcp_table->inbufs_total - limit_ibuf_size;
-	ssize_t free_outbuf = (ssize_t)tcp_table->outbufs_total - limit_obuf_size;
+	ssize_t free_inbuf =  (ssize_t)tcp_table->inbufs_total - MIN(limit_ibuf_size, SSIZE_MAX);
+	ssize_t free_outbuf = (ssize_t)tcp_table->outbufs_total - MIN(limit_ibuf_size, SSIZE_MAX);
 
 	// reset connections to free ibufs
 	while (free_inbuf > 0 && rl != rl_max) {