linux-kernel - Re: lib/idr.c: initialize struct idr

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Date:	Sun, 27 Jan 2008 23:00:29 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	"Jim Houston" <jim.houston@...r.com>,
	"Ingo Molnar" <mingo@...e.hu>, "Tejun Heo" <htejun@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: lib/idr.c: initialize struct idr_layer

Hi Vegard,

On Jan 27, 2008 10:07 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> I am testing my kmemcheck patches, and it has come up with a couple of
> uses of uninitialized memory in lib/idr.c. These are (the line numbers
> may differ slightly):

[snip]

> @@ -39,12 +39,16 @@ static struct idr_layer *alloc_layer(struct idr *idp)
>  {
>         struct idr_layer *p;
>         unsigned long flags;
> +       int i;
>
>         spin_lock_irqsave(&idp->lock, flags);
>         if ((p = idp->id_free)) {
>                 idp->id_free = p->ary[0];
>                 idp->id_free_cnt--;
> -               p->ary[0] = NULL;
> +               p->bitmap = 0;
> +               for(i = 0; i < ARRAY_SIZE(p->ary); ++i)
> +                       p->ary[i] = NULL;
> +               p->count = 0;

But aren't these zeroed by idr_cache_ctor() already?

>         }
>         spin_unlock_irqrestore(&idp->lock, flags);
>         return(p);

                        Pekka
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