Fix anetCloexec for Sentinel TLS conns. (#8377)

The flag should be set before TLS negotiation begins to avoid a race
condition where a fork+exec before it is completed ends up leaking the
file descriptor.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/sentinel.c b/src/sentinel.c
index 9da7732a0..75030df78 100644
--- a/src/sentinel.c
+++ b/src/sentinel.c
@@ -2126,6 +2126,7 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
     /* Commands connection. */
     if (link->cc == NULL) {
         link->cc = redisAsyncConnectBind(ri->addr->ip,ri->addr->port,NET_FIRST_BIND_ADDR);
+        if (!link->cc->err) anetCloexec(link->cc->c.fd);
         if (!link->cc->err && server.tls_replication &&
                 (instanceLinkNegotiateTLS(link->cc) == C_ERR)) {
             sentinelEvent(LL_DEBUG,"-cmd-link-reconnection",ri,"%@ #Failed to initialize TLS");
@@ -2135,7 +2136,6 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
                 link->cc->errstr);
             instanceLinkCloseConnection(link,link->cc);
         } else {
-            anetCloexec(link->cc->c.fd);
             link->pending_commands = 0;
             link->cc_conn_time = mstime();
             link->cc->data = link;
@@ -2154,6 +2154,7 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
     /* Pub / Sub */
     if ((ri->flags & (SRI_MASTER|SRI_SLAVE)) && link->pc == NULL) {
         link->pc = redisAsyncConnectBind(ri->addr->ip,ri->addr->port,NET_FIRST_BIND_ADDR);
+        if (!link->pc->err) anetCloexec(link->pc->c.fd);
         if (!link->pc->err && server.tls_replication &&
                 (instanceLinkNegotiateTLS(link->pc) == C_ERR)) {
             sentinelEvent(LL_DEBUG,"-pubsub-link-reconnection",ri,"%@ #Failed to initialize TLS");
@@ -2163,7 +2164,6 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
             instanceLinkCloseConnection(link,link->pc);
         } else {
             int retval;
-            anetCloexec(link->pc->c.fd);
             link->pc_conn_time = mstime();
             link->pc->data = link;
             redisAeAttach(server.el,link->pc);