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io_uring: fix multishots with selected buffers

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: b3fdea6ecb55c ("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>

authored by

Pavel Begunkov and committed by
Jens Axboe d63b0e8a a23ad06b

+2
+2
io_uring/poll.c
··· 315 315 316 316 ret = io_poll_check_events(req, ts); 317 317 if (ret == IOU_POLL_NO_ACTION) { 318 + io_kbuf_recycle(req, 0); 318 319 return; 319 320 } else if (ret == IOU_POLL_REQUEUE) { 321 + io_kbuf_recycle(req, 0); 320 322 __io_poll_execute(req, 0); 321 323 return; 322 324 }