From 718ef9e15e431ab282faf5572f632fcede95234f Mon Sep 17 00:00:00 2001
From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Fri, 22 Dec 2017 09:38:59 -0800
Subject: [PATCH 3/4] rds; Reset rs->rs_bound_addr in rds_add_bound() failure
path
Git-commit: 7ae0c649c47f1c5d2db8cee6dd75855970af1669
Patch-mainline: v4.16-rc1
References: git-fixes
If the rds_sock is not added to the bind_hash_table, we must
reset rs_bound_addr so that rds_remove_bound will not trip on
this rds_sock.
rds_add_bound() does a rds_sock_put() in this failure path, so
failing to reset rs_bound_addr will result in a socket refcount
bug, and will trigger a WARN_ON with the stack shown below when
the application subsequently tries to close the PF_RDS socket.
WARNING: CPU: 20 PID: 19499 at net/rds/af_rds.c:496 \
rds_sock_destruct+0x15/0x30 [rds]
:
__sk_destruct+0x21/0x190
rds_remove_bound.part.13+0xb6/0x140 [rds]
rds_release+0x71/0x120 [rds]
sock_release+0x1a/0x70
sock_close+0xe/0x20
__fput+0xd5/0x210
task_work_run+0x82/0xa0
do_exit+0x2ce/0xb30
? syscall_trace_enter+0x1cc/0x2b0
do_group_exit+0x39/0xa0
SyS_exit_group+0x10/0x10
do_syscall_64+0x61/0x1a0
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
net/rds/bind.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/rds/bind.c b/net/rds/bind.c
index 0ca194881460..fc547072b79c 100644
--- a/net/rds/bind.c
+++ b/net/rds/bind.c
@@ -116,6 +116,7 @@ static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
rs, &addr, (int)ntohs(*port));
break;
} else {
+ rs->rs_bound_addr = 0;
rds_sock_put(rs);
ret = -ENOMEM;
break;
--
2.16.4