netdev - [PATCH RFC net-next] Cancel any pending connection attempts before taking down connection

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Message-Id: <1488246240-159171-1-git-send-email-sowmini.varadhan@oracle.com>
Date:   Mon, 27 Feb 2017 17:44:00 -0800
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     sowmini.varadhan@...cle.com
Subject: [PATCH RFC net-next] Cancel any pending connection attempts before taking down connection

This is a test patch being supplied for a trial run on syzkaller.

Explicitly cancel the workq before releasing resources that
will allow netns deletion, so that the connect request does
not trip up on a use-after free of the netns afterward.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
---
 net/rds/tcp.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index 57bb523..2568eb1 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -509,6 +509,8 @@ static void rds_tcp_conn_paths_destroy(struct rds_connection *conn)
 
 	for (i = 0; i < RDS_MPATH_WORKERS; i++) {
 		cp = &conn->c_path[i];
+		if (cancel_delayed_work_sync(&cp->cp_conn_w))
+			pr_info("cancelled on path %d\n", i);
 		tc = cp->cp_transport_data;
 		if (!tc->t_sock)
 			continue;
-- 
1.7.1