linux-kernel - Re: [PATCH] x86/pat: fix memory leak in free

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Date:	Tue, 25 May 2010 17:12:22 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: Re: [PATCH] x86/pat: fix memory leak in free_memtype

On Tue, 2010-05-25 at 02:52 -0700, Xiaotian Feng wrote:
> reserve_memtype will allocate memory for new memtype, but
> in free_memtype, after the memtype erased from rbtree, the
> memory is not freed.
> 
> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> Cc: Jack Steiner <steiner@....com>
> Cc: Suresh Siddha <suresh.b.siddha@...el.com>
> ---
>  arch/x86/mm/pat_rbtree.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/mm/pat_rbtree.c b/arch/x86/mm/pat_rbtree.c
> index 07de4cb..fb8c1e5 100644
> --- a/arch/x86/mm/pat_rbtree.c
> +++ b/arch/x86/mm/pat_rbtree.c
> @@ -15,6 +15,7 @@
>  #include <linux/rbtree.h>
>  #include <linux/sched.h>
>  #include <linux/gfp.h>
> +#include <linux/slab.h>
>  
>  #include <asm/pgtable.h>
>  #include <asm/pat.h>
> @@ -240,6 +241,7 @@ int rbt_memtype_erase(u64 start, u64 end)
>  		return -EINVAL;
>  
>  	rb_erase(&data->rb, &memtype_rbroot);
> +	kfree(data);
>  	return 0;
>  }

Acked-by: Suresh Siddha <suresh.b.siddha@...el.com>

Peter, Please apply this for x86/urgent, this is introduced in the post
2.6.34 changes.

thanks,
suresh

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