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SubjectRe: [PATCH] remember to check return value from __copy_to_user() in cdrom_read_cdda_old()
On Tue, Sep 07 2004, Paul Mackerras wrote:
> 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.

but it doesn't matter, if it returns non-zero then something happened
between the access_ok() and the actual copy because the user app did
something silly. so I don't care much really, I think the major point is
the kernel will cope.

you could remove the access_ok() and change it to a copy_to_user()
instead, I don't care either way. it's the old and slow interface which
really never is used unless things have gone wrong anyways.

--
Jens Axboe

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