netdev - RE: [PATCH 2/3] staging: r8188eu: Fix case where ethtype was never obtained and always be checked against 0

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Date:	Thu, 10 Apr 2014 09:14:56 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Dan Carpenter' <dan.carpenter@...cle.com>,
	Larry Finger <Larry.Finger@...inger.net>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Stable <stable@...r.kernel.org>
Subject: RE: [PATCH 2/3] staging: r8188eu: Fix case where ethtype was never
 obtained and always be checked against 0

From: Dan Carpenter
...
> > -	if (auth_alg == 2) {
> > +	if (auth_alg == dot11AuthAlgrthm_8021X) {
> > +		/* get ether_type */
> > +		ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
> > +		memcpy(&ether_type, ptr, 2);
> > +		ether_type = ntohs((unsigned short)ether_type);
> 
> This cast doesn't make sense.  u16 and unsigned short are the same
> thing.  Anyway, the "ether_type" should be declared as __be16 because
> it's network endian.

Is it worth doing just:
	ether_type = ptr[0] << 8 | ptr[1];
Or, if 'ptr' can't be misaligned, just reading a BE short.
If the compiler doesn't inline memcpy() the above code is horrid.

Are there MD inline functions for reading misaligned 16/32 bit date
with specific endianness?

	David



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