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1860c2f859
blk_validate_limits() requires max_hw_sectors >= PAGE_SECTORS and fires a WARN_ON_ONCE if this invariant is violated. ublk_validate_params() only checked the upper bound of max_sectors against max_io_buf_bytes, allowing userspace to pass small values (including zero) that trigger the warning when blk_mq_alloc_disk() is called from ublk_ctrl_start_dev(). Before494ea040bc, ublk used blk_queue_max_hw_sectors() which silently clamped small values up to PAGE_SECTORS. The conversion to passing queue_limits directly to blk_mq_alloc_disk() lost that clamping and now hits blk_validate_limits()'s WARN_ON_ONCE instead. Validate that max_sectors is at least PAGE_SECTORS in ublk_validate_params() so invalid values are rejected early with -EINVAL instead of reaching the block layer. Fixes:494ea040bc("ublk: pass queue_limits to blk_mq_alloc_disk") Signed-off-by: Ming Lei <tom.leiming@gmail.com> Link: https://patch.msgid.link/20260510144843.769031-1-tom.leiming@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>