linux-kernel - Re: [PATCH v2 01/29] slab: dup name string

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Date:	Tue, 15 May 2012 15:04:14 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Glauber Costa <glommer@...allels.com>
cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Greg Thelen <gthelen@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>, devel@...nvz.org,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH v2 01/29] slab: dup name string

On Fri, 11 May 2012, Glauber Costa wrote:

> diff --git a/mm/slab.c b/mm/slab.c
> index e901a36..91b9c13 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -2118,6 +2118,7 @@ static void __kmem_cache_destroy(struct kmem_cache *cachep)
>  			kfree(l3);
>  		}
>  	}
> +	kfree(cachep->name);
>  	kmem_cache_free(&cache_cache, cachep);
>  }
>  
> @@ -2526,7 +2527,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
>  		BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
>  	}
>  	cachep->ctor = ctor;
> -	cachep->name = name;
> +	cachep->name = kstrdup(name, GFP_KERNEL);
>  
>  	if (setup_cpu_cache(cachep, gfp)) {
>  		__kmem_cache_destroy(cachep);

Couple problems:

 - allocating memory for a string of an unknown, unchecked size, and

 - could potentially return NULL which I suspect will cause problems 
   later.
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