Re: [PATCH v2] 9p/trans_fd: Fix concurrency del of req_list in p9_fd_cancelled/p9_read_work

[Dominique Martinet]

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@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Wang Hai <wanghai38@xxxxxxxxxx>

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