io_uring: fix racy overflow count reporting
All ->cq_overflow modifications should be under completion_lock, otherwise it can report a wrong number to the userspace. Fix it in io_uring_cancel_files(). Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -7847,10 +7847,9 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
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clear_bit(0, &ctx->cq_check_overflow);
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ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
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}
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spin_unlock_irq(&ctx->completion_lock);
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WRITE_ONCE(ctx->rings->cq_overflow,
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atomic_inc_return(&ctx->cached_cq_overflow));
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spin_unlock_irq(&ctx->completion_lock);
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/*
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* Put inflight ref and overflow ref. If that's
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