linux-kernel - Re: [PATCH 1/2] staging: rtl8188eu: fix usage of uninit scalar in rtw_drv

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Date:	Sat, 17 May 2014 20:56:35 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, Jes.Sorensen@...hat.com,
	Larry.Finger@...inger.net
Subject: Re: [PATCH 1/2] staging: rtl8188eu: fix usage of uninit scalar in
 rtw_drv_init()

On Sat, 17 May 2014 17:44:23 +0300, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> On Sat, May 17, 2014 at 12:38:57PM +0200, Christian Engelmayer wrote:
> > Function rtw_drv_init() is written in a way that assumes 'status' != _SUCCESS
> > as long as not explicitly set. Thus initialize 'status' to FAIL, in order to
> > prevent undefined behaviour if going through the exit paths. Detected by
> > Coverity - CID 1077832.
> > 
> > Signed-off-by: Christian Engelmayer <cengelma@....at>
> 
> This is a bugfix and we like to merge bugfixes without asking redo
> things, so don't redo.  But really the better fix is to get rid of the
> status variable completely.  Just return directly on the success path.
> 
> If we were to do that, then both patches would be merged together and
> called:  [patch] Staging: rtl8188eu: fix error handling in rtw_drv_init()
> 
> But this patch is also acceptable as-is.  Thanks for fixing the bug.  :)

I agree with You Dan. I'm no big fan of that status variable either. In this
case I was already tempted, but saw it as a recurring pattern in that file
in case cleanup is done. So I decided to just attack the bug in a small change
and leave the cleanup of the error handling pattern for a later, consistent
sweep over the whole file if that's wanted.

Regards,
Christian
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