On Tue 2013-09-17 13:50:21, Sebastian Capella wrote:
> Quoting Sebastian Capella (2013-08-30 11:42:30)
> > Quoting Pavel Machek (2013-08-30 04:35:33)
> > > On Mon 2013-08-26 10:40:50, Sebastian Capella wrote:
> > > > Quoting Pavel Machek (2013-08-25 08:38:11)
> > > > > Is the allocation actually neccessary? At the very least this should
> > > > > test for NULL...
> > > >
> > > > name_to_dev_t expects a non-const name, but the buffer passed in
> > > > is const. I also am removing the '\n' if found at the end of the
> > > > string which would violate the const.
> > >
> > > Fix name_to_dev_t, then. No need to do memory allocation just to work
> > > around const.
> > >
> > Hi Pavel,
> >
> > The issue is really Removing the \n from the user space input. The
> > flow is:
> > const input buf -> copy to work buffer, remove newline -> name_to_dev_t
> >
> > ssize_t resume_store(..., const char *buf, size_t n)
> > // copy buf, strip off trailing newline, pass to name_to_dev_t
> > dev_t name_to_dev_t(char *name)
> >
> > The const in the restore_store buffer comes from the function type of the
> > store member of the kobj_attribute. I don't believe this should be changed.
> >
> > Currently, name_to_dev_t will fail in some cases if a trailing \n is
> > present.
> > Is it more appropriate to handle stripping the newline in the store
> > function rather than modifying name_to_dev_t to clean it up?
> >
> > It seems logical for name_to_dev_t to take a const name parameter as
> > there should be no reason to modify the name buffer passed to it.
> > I'll be happy to make a patch to do this, but without hardening
> > name_to_dev_t against trailing newlines, it would not be neccesary for
> > this problem.
> >
> > Thanks for your time and comments!
> >
>
> Hi Pavel,
>
> Do you have any more feedback regarding leaving the strndup?
I think you should modify name_to_dev_t, then. Doing memory allocation
just to work around \n limitation is ugly.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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