Caleb Sander Mateos ed9f54cc1e
ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd ...
struct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in
userspace-mapped memory. It's racy to access its fields with normal
loads, as userspace may write to them concurrently. Use READ_ONCE() to
copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the
local copy in place of the one in the io_uring_sqe.
Fixes: 87213b0d84csander@purestorage.com >
Reviewed-by: Ming Lei <ming.lei@redhat.com >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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