io_uring: Fix leaking linked timeouts

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let have a dependant link: REQ -> LINK_TIMEOUT -> LINK_TIMEOUT

1. submission stage: submission references for REQ and LINK_TIMEOUT
are dropped. So, references respectively (1,1,2)

2. io_put(REQ) + FAIL_LINKS stage: calls io_fail_links(), which for all
linked timeouts will call cancel_timeout() and drop 1 reference.
So, references after: (0,0,1). That's a leak.

Make it treat only the first linked timeout as such, and pass others
through __io_double_put_req().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2019-11-19 23:32:50 +03:00 • committed by Jens Axboe

parent f70193d6d8

commit 09fbb0a83e

1 changed files with 1 additions and 0 deletions

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fs/io_uring.c

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