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io_uring: fix multishots with selected buffers

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[ upstream commit d63b0e8a628e62ca85a0f7915230186bb92f8bb4 ]

We do io_kbuf_recycle() when arming a poll but every iteration of a
multishot can grab more buffers, which is why we need to flush the kbuf
ring state before continuing with waiting.

Cc: stable@vger.kernel.org
Fixes: b3fdea6ecb ("io_uring: multishot recv")
Reported-by: Muhammad Ramdhan <ramdhan@starlabs.sg>
Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Reported-by: Jacob Soo <jacob.soo@starlabs.sg>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1bfc9990fe435f1fc6152ca9efeba5eb3e68339c.1738025570.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2025-02-10 17:27:54 +00:00 committed by Greg Kroah-Hartman
parent 30ab0f6c90
commit 233b210a67
1 changed files with 2 additions and 0 deletions
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2
io_uring/poll.c
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@ -307,6 +307,8 @@ static int io_poll_check_events(struct io_kiocb *req, bool *locked)
}
} else {
int ret = io_poll_issue(req, locked);
io_kbuf_recycle(req, 0);
if (ret == IOU_STOP_MULTISHOT)
return IOU_POLL_REMOVE_POLL_USE_RES;
if (ret < 0)