From 136c0771ad315c1dd38eb9ec690c1a2434346700 Mon Sep 17 00:00:00 2001
From: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Date: Wed, 18 Mar 2020 05:18:24 -0400
Subject: [PATCH] lib/iscsi: Return when connection state is already exited at
 login completion

iSCSI target got segmentation fault if connection is being exited
between spdk_iscsi_conn_write_pdu() and its callback
iscsi_conn_login_pdu_success_complete() are executed.

This was caused by recent asynchronous socket write feature.

Fixes issue #1278.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1275 (master)

(cherry picked from commit 628dc9c16279b23b5d594639e98851912546cab2)
Change-Id: Idffd90cd6ee8e6cb4298fe3f1363d8d5c5a3c49d
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1355
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
---
 lib/iscsi/iscsi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/iscsi/iscsi.c b/lib/iscsi/iscsi.c
index d5a67f631..d44e36245 100644
--- a/lib/iscsi/iscsi.c
+++ b/lib/iscsi/iscsi.c
@@ -1138,6 +1138,11 @@ iscsi_conn_login_pdu_success_complete(void *arg)
 {
 	struct spdk_iscsi_conn *conn = arg;
 
+	if (conn->state >= ISCSI_CONN_STATE_EXITING) {
+		/* Connection is being exited before this callback is executed. */
+		SPDK_DEBUGLOG(SPDK_LOG_ISCSI, "Connection is already exited.\n");
+		return;
+	}
 	if (conn->full_feature) {
 		if (iscsi_conn_params_update(conn) != 0) {
 			return;