netdev - Re: [Patch net] llc: set SOCK_RCU_FREE in llc_sap_add

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Date:   Mon, 15 Oct 2018 22:02:05 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [Patch net] llc: set SOCK_RCU_FREE in llc_sap_add_socket()

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Thu, 11 Oct 2018 11:15:13 -0700

> 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@...kaller.appspotmail.com
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied and queued up for -stable.