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Date: Wed, 4 Oct 2017 12:11:48 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Hans de Goede <hdegoede@...hat.com> Cc: Christoph Hellwig <hch@...radead.org>, Arnd Bergmann <arnd@...db.de>, Michael Thayer <michael.thayer@...cle.com>, "Knut St . Osmundsen" <knut.osmundsen@...cle.com>, Larry Finger <Larry.Finger@...inger.net>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] virt: Add vboxguest driver for Virtual Box Guest integration On Wed, Oct 04, 2017 at 11:32:23AM +0200, Hans de Goede wrote: > Hi, > > On 03-10-17 13:41, Hans de Goede wrote: > > <snip> > > > > > +#define CHECK_IOCTL_IN(req) \ > > > > +do { \ > > > > + if ((req)->Hdr.cbIn != (sizeof((req)->Hdr) + sizeof((req)->u.In)) || \ > > > > + (req)->Hdr.cbOut != sizeof((req)->Hdr)) \ > > > > + return -EINVAL; \ > > > > +} while (0) > > > > > > Make these things functions instead of macros. > > > > Turning these into functions is a good idea I will do so for v2. > > Correction, I forgot that the passed in "req" macro > argument has a different type with all the calls, so > these cannot be changed into functions because they > rely on sizeof on the specific type to do the size > checks. Don't we already have built-in checks for these types of things? Surely we don't require each ioctl user in the kernel to do this by themselves... thanks, greg k-h
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