linux-kernel - Re: [PATCH] netlink: fix overrun in attribute iteration

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Message-Id: <20080911230244.d76a7310.akpm@linux-foundation.org>
Date:	Thu, 11 Sep 2008 23:02:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, tgraf@...g.ch,
	penberg@...helsinki.fi, mingo@...e.hu, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netlink: fix overrun in attribute iteration

On Fri, 12 Sep 2008 07:42:36 +0200 "Vegard Nossum" <vegard.nossum@...il.com> wrote:

> On Fri, Sep 12, 2008 at 1:52 AM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Thu, 11 Sep 2008 22:59:33 +0200
> > Vegard Nossum <vegard.nossum@...il.com> wrote:
> >
> >>   #include <stdio.h>
> >>
> >>   main(void)
> >>   {
> >>           printf("%d\n", -1 >= sizeof(int));
> >>   }
> >>
> >
> > akpm:/home/akpm> gcc -W t.c
> > t.c: In function 'main':
> > t.c:5: warning: comparison between signed and unsigned
> >
> > Make of that what you will :)
> 
> It doesn't show up with -Wall and the kernel isn't compiled with -W
> (aka. -Wextra) as far as I can see. Should it be turned on?
> 

Last time I turned on -W, a full kernel build emitted nearly 10MB of
warnings.

Alas, some of them are useful, as we see here.  They can be turned on
piecemeal - this one is -Wsign-compare, I think.

I think it would be good if owners of particular parts of the kernel
were to occasionally build their stuff with -W and spend half an hour
contemplating the result.  Ditto `make C=1', to see what sparse thinks.


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