89 lines
3.2 KiB
Diff
89 lines
3.2 KiB
Diff
From ed4eda5ebc77c08b7ef1e6c94bea373c00c903c8 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
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Date: Tue, 17 May 2022 21:31:37 +0200
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Subject: [PATCH] Move setting the sock->write_timeout to the async_*send
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Setting the sock->write_timeout from the TCP, TCPDNS, and TLSDNS send
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functions could lead to (harmless) data race when setting the value for
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the first time when the isc_nm_send() function would be called from
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thread not-matching the socket we are sending to. Move the setting the
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sock->write_timeout to the matching async function which is always
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called from the matching thread.
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(cherry picked from commit 61117840c18778e69e3073cc01dbea579271a014)
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Conflict: NA
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Reference: https://gitlab.isc.org/isc-projects/bind9/-/commit/ed4eda5ebc77c08b7ef1e6c94bea373c00c903c8
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---
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lib/isc/netmgr/tcp.c | 14 +++++++-------
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lib/isc/netmgr/tcpdns.c | 15 ++++++++-------
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2 files changed, 15 insertions(+), 14 deletions(-)
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diff --git a/lib/isc/netmgr/tcp.c b/lib/isc/netmgr/tcp.c
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index a8d1dba6d4..eaad8da7c6 100644
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--- a/lib/isc/netmgr/tcp.c
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+++ b/lib/isc/netmgr/tcp.c
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@@ -1083,13 +1083,6 @@ isc__nm_tcp_send(isc_nmhandle_t *handle, const isc_region_t *region,
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uvreq->cb.send = cb;
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uvreq->cbarg = cbarg;
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- if (sock->write_timeout == 0) {
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- sock->write_timeout =
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- (atomic_load(&sock->keepalive)
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- ? atomic_load(&sock->mgr->keepalive)
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- : atomic_load(&sock->mgr->idle));
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- }
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-
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ievent = isc__nm_get_netievent_tcpsend(sock->mgr, sock, uvreq);
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isc__nm_maybe_enqueue_ievent(&sock->mgr->workers[sock->tid],
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(isc__netievent_t *)ievent);
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@@ -1134,6 +1127,13 @@ isc__nm_async_tcpsend(isc__networker_t *worker, isc__netievent_t *ev0) {
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REQUIRE(sock->tid == isc_nm_tid());
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UNUSED(worker);
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+ if (sock->write_timeout == 0) {
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+ sock->write_timeout =
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+ (atomic_load(&sock->keepalive)
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+ ? atomic_load(&sock->mgr->keepalive)
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+ : atomic_load(&sock->mgr->idle));
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+ }
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+
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result = tcp_send_direct(sock, uvreq);
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if (result != ISC_R_SUCCESS) {
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isc__nm_incstats(sock->mgr, sock->statsindex[STATID_SENDFAIL]);
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diff --git a/lib/isc/netmgr/tcpdns.c b/lib/isc/netmgr/tcpdns.c
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index e287f0a282..6f513b49ce 100644
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--- a/lib/isc/netmgr/tcpdns.c
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+++ b/lib/isc/netmgr/tcpdns.c
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@@ -1088,13 +1088,6 @@ isc__nm_tcpdns_send(isc_nmhandle_t *handle, isc_region_t *region,
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uvreq->cb.send = cb;
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uvreq->cbarg = cbarg;
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- if (sock->write_timeout == 0) {
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- sock->write_timeout =
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- (atomic_load(&sock->keepalive)
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- ? atomic_load(&sock->mgr->keepalive)
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- : atomic_load(&sock->mgr->idle));
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- }
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-
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ievent = isc__nm_get_netievent_tcpdnssend(sock->mgr, sock, uvreq);
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isc__nm_maybe_enqueue_ievent(&sock->mgr->workers[sock->tid],
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(isc__netievent_t *)ievent);
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@@ -1141,6 +1134,14 @@ isc__nm_async_tcpdnssend(isc__networker_t *worker, isc__netievent_t *ev0) {
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isc_result_t result;
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isc_nmsocket_t *sock = ievent->sock;
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isc__nm_uvreq_t *uvreq = ievent->req;
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+
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+ if (sock->write_timeout == 0) {
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+ sock->write_timeout =
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+ (atomic_load(&sock->keepalive)
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+ ? atomic_load(&sock->mgr->keepalive)
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+ : atomic_load(&sock->mgr->idle));
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+ }
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+
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uv_buf_t bufs[2] = { { .base = uvreq->tcplen, .len = 2 },
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{ .base = uvreq->uvbuf.base,
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.len = uvreq->uvbuf.len } };
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--
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2.23.0
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