linux-kernel - Re: [PATCH v2] 9p/trans_fd: Fix concurrency del of req_list in p9_fd_cancelled/p9_read

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Message-ID: <20200612091044.GA11129@nautica>
Date:   Fri, 12 Jun 2020 11:10:44 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Wang Hai <wanghai38@...wei.com>
Cc:     ericvh@...il.com, lucho@...kov.net, davem@...emloft.net,
        v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] 9p/trans_fd: Fix concurrency del of req_list in
 p9_fd_cancelled/p9_read_work

Wang Hai wrote on Fri, Jun 12, 2020:
> p9_read_work and p9_fd_cancelled may be called concurrently.
> In some cases, req->req_list may be deleted by both p9_read_work
> and p9_fd_cancelled.
> 
> We can fix it by ignoring replies associated with a cancelled
> request and ignoring cancelled request if message has been received
> before lock.
> 
> Fixes: 60ff779c4abb ("9p: client: remove unused code and any reference to "cancelled" function")
> Reported-by: syzbot+77a25acfa0382e06ab23@...kaller.appspotmail.com
> Signed-off-by: Wang Hai <wanghai38@...wei.com>

Thanks! looks good to me, I'll queue for 5.9 as well unless you're in a
hurry.
-- 
Dominique