io_uring: fix io_prep_async_link locking
io_prep_async_link() may be called after arming a linked timeout, automatically making it unsafe to traverse the linked list. Guard with completion_lock if there was a linked timeout. Cc: stable@vger.kernel.org # 5.9+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/93f7c617e2b4f012a2a175b3dab6bc2f27cebc48.1627304436.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1279,8 +1279,17 @@ static void io_prep_async_link(struct io_kiocb *req)
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{
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struct io_kiocb *cur;
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io_for_each_link(cur, req)
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io_prep_async_work(cur);
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if (req->flags & REQ_F_LINK_TIMEOUT) {
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struct io_ring_ctx *ctx = req->ctx;
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spin_lock_irq(&ctx->completion_lock);
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io_for_each_link(cur, req)
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io_prep_async_work(cur);
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spin_unlock_irq(&ctx->completion_lock);
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} else {
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io_for_each_link(cur, req)
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io_prep_async_work(cur);
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}
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}
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static void io_queue_async_work(struct io_kiocb *req)
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