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    [PATCH] splice: fix problems with sys_tee() · aadd06e5
    Jens Axboe 提交于
    Several issues noticed/fixed:
    
    - We cannot reliably block in link_pipe() while holding both input and output
      mutexes. So do preparatory checks before locking down both mutexes and doing
      the link.
    
    - The ipipe->nrbufs vs i check was bad, because we could have dropped the
      ipipe lock in-between. This causes us to potentially look at unknown
      buffers if we were racing with someone else reading this pipe.
    Signed-off-by: NJens Axboe <axboe@suse.de>
    aadd06e5
splice.c 34.4 KB