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io_uring: fix poll requests leaking second poll entries
For pure poll requests, it doesn't remove the second poll wait entry
when it's done, neither after vfs_poll() or in the poll completion
handler. We should remove the second poll wait entry.
And we use io_poll_remove_double() rather than io_poll_remove_waitqs()
since the latter has some redundant logic.
Fixes: 88e41cf928
("io_uring: add multishot mode for IORING_OP_POLL_ADD")
Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210728030322.12307-1-haoxu@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
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@ -4939,7 +4939,6 @@ static bool io_poll_complete(struct io_kiocb *req, __poll_t mask)
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if (req->poll.events & EPOLLONESHOT)
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flags = 0;
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if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) {
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io_poll_remove_waitqs(req);
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req->poll.done = true;
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flags = 0;
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}
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@ -4962,6 +4961,7 @@ static void io_poll_task_func(struct io_kiocb *req)
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done = io_poll_complete(req, req->result);
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if (done) {
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io_poll_remove_double(req);
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hash_del(&req->hash_node);
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} else {
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req->result = 0;
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@ -5149,7 +5149,7 @@ static __poll_t __io_arm_poll_handler(struct io_kiocb *req,
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ipt->error = -EINVAL;
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spin_lock_irq(&ctx->completion_lock);
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if (ipt->error)
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if (ipt->error || (mask && (poll->events & EPOLLONESHOT)))
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io_poll_remove_double(req);
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if (likely(poll->head)) {
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spin_lock(&poll->head->lock);
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@ -5221,7 +5221,6 @@ static int io_arm_poll_handler(struct io_kiocb *req)
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ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask,
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io_async_wake);
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if (ret || ipt.error) {
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io_poll_remove_double(req);
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spin_unlock_irq(&ctx->completion_lock);
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if (ret)
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return IO_APOLL_READY;
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