linux-kernel - Re: Fwd: [PATCH] x86: Plug memory leak in sparse irq

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Message-ID: <4CA25E5C.2020203@kernel.org>
Date:	Tue, 28 Sep 2010 14:30:04 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Fwd: [PATCH] x86: Plug memory leak in sparse irq

> From: Thomas Gleixner <tglx@...utronix.de>
> Date: Tue, Sep 28, 2010 at 11:57 AM
> Subject: [PATCH] x86: Plug memory leak in sparse irq
> To: LKML <linux-kernel@...r.kernel.org>
> Cc: x86@...nel.org, Yinghai Lu <yhlu.kernel@...il.com>
> 
> 
> free_irq_cfg() is not freeing the cpumask_vars in irq_cfg.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: stable@...nel.org
> ---
>  arch/x86/kernel/apic/io_apic.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
> +++ linux-2.6/arch/x86/kernel/apic/io_apic.c
> @@ -311,9 +311,11 @@ void arch_init_copy_chip_data(struct irq
>        init_copy_irq_2_pin(old_cfg, cfg, node);
>  }
> 
> -static void free_irq_cfg(struct irq_cfg *old_cfg)
> +static void free_irq_cfg(struct irq_cfg *cfg)
>  {
> -       kfree(old_cfg);
> +       free_cpumask_var(cfg->domain);
> +       free_cpumask_var(cfg->old_domain);
> +       kfree(cfg);
>  }
> 
>  void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)

yes. still need

[PATCH] x86: copy cpumask while copying chip_data for offstack cpumask

While looking Thomas's
|	x86: Plug memory leak in sparse irq

found copy_chip_data() could copy the cpumask pointers instead of real data.
Need to use cpumask_copy there.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: stable@...nel.org

---
 arch/x86/kernel/apic/io_apic.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -306,7 +306,10 @@ void arch_init_copy_chip_data(struct irq
 
 	old_cfg = old_desc->chip_data;
 
-	memcpy(cfg, old_cfg, sizeof(struct irq_cfg));
+	cfg->vector = old_cfg->vector;
+	cfg->move_in_progress = old_cfg->move_in_progress;
+	cpumask_copy(cfg->domain, old_cfg->domain);
+	cpumask_copy(cfg->old_domain, old_cfg->old_domain);
 
 	init_copy_irq_2_pin(old_cfg, cfg, node);
 }
--
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