Re: [PATCH] remember to check return value from __copy_to_user() in cdrom_read_cdda_old()

[Paul Mackerras]

Jens Axboe writes:

> __copy_to_user is the unchecking version of copy_to_user.

It doesn't range-check the address, but it does return non-zero
(number of bytes not copied) if it encounters a fault writing to the
user buffer.

Paul.
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