netdev - [PATCH net] sctp: kfree

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Date:   Sat,  1 Dec 2018 01:36:59 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: [PATCH net] sctp: kfree_rcu asoc

In sctp_hash_transport/sctp_epaddr_lookup_transport, it dereferences
a transport's asoc under rcu_read_lock while asoc is freed not after
a grace period, which leads to a use-after-free panic.

This patch fixes it by calling kfree_rcu to make asoc be freed after
a grace period.

Note that only the asoc's memory is delayed to free in the patch, it
won't cause sk to linger longer.

Thanks Neil and Marcelo to make this clear.

Fixes: 7fda702f9315 ("sctp: use new rhlist interface on sctp transport rhashtable")
Fixes: cd2b70875058 ("sctp: check duplicate node before inserting a new transport")
Reported-by: syzbot+0b05d8aa7cb185107483@...kaller.appspotmail.com
Reported-by: syzbot+aad231d51b1923158444@...kaller.appspotmail.com
Suggested-by: Neil Horman <nhorman@...driver.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/net/sctp/structs.h | 2 ++
 net/sctp/associola.c       | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index a11f937..feada35 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -2075,6 +2075,8 @@ struct sctp_association {
 
 	__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
 	__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
+
+	struct rcu_head rcu;
 };
 
 
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 6a28b96..3702f48 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -434,7 +434,7 @@ static void sctp_association_destroy(struct sctp_association *asoc)
 
 	WARN_ON(atomic_read(&asoc->rmem_alloc));
 
-	kfree(asoc);
+	kfree_rcu(asoc, rcu);
 	SCTP_DBG_OBJCNT_DEC(assoc);
 }
 
-- 
2.1.0