[PATCH 4.9 138/171] llc: set SOCK_RCU_FREE in llc_sap_add_socket()

Greg Kroah-Hartman
2018-11-08T22:07:36Z

From: Cong Wang <xiyou.wangcong@gmail.com>

[ Upstream commit 5a8e7aea953bdb6d4da13aff6f1e7f9c62023499 ]

WHen an llc sock is added into the sk_laddr_hash of an llc_sap,
it is not marked with SOCK_RCU_FREE.

This causes that the sock could be freed while it is still being
read by __llc_lookup_established() with RCU read lock. sock is
refcounted, but with RCU read lock, nothing prevents the readers
getting a zero refcnt.

Fix it by setting SOCK_RCU_FREE in llc_sap_add_socket().

Reported-by: syzbot+11e05f04c15e03be5254@syzkaller.appspotmail.com
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/llc/llc_conn.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -734,6 +734,7 @@ void llc_sap_add_socket(struct llc_sap *
llc_sk(sk)->sap = sap;

spin_lock_bh(&sap->sk_lock);
+ sock_set_flag(sk, SOCK_RCU_FREE);
sap->sk_count++;
sk_nulls_add_node_rcu(sk, laddr_hb);
hlist_add_head(&llc->dev_hash_node, dev_hb);