Re: [Xen-devel] [PATCH] xen/arm: domain_vgic_init: Avoid double free on shared_irqs

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian and Stefano,

Ping?

On 25/07/14 07:17, Julien Grall wrote:
> When the function domain_vgic_init is failing to initialize pending_irqs,
> it will free shared_irqs. Few call later, domain_vgic_free will be called
> an try to free a second time the same variable. This will result to a double
> free.
>
> Remove the free in domain_vgic_init and rely on domain_vgic_free to correctly
> release the memory.
>
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
>
> ---
>
> This patch should be backported to Xen 4.4.
> ---
>   xen/arch/arm/vgic.c |    3 ---
>   1 file changed, 3 deletions(-)
>
> diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
> index aba613b..edbb71a 100644
> --- a/xen/arch/arm/vgic.c
> +++ b/xen/arch/arm/vgic.c
> @@ -84,10 +84,7 @@ int domain_vgic_init(struct domain *d, unsigned int nr_spis)
>       d->arch.vgic.pending_irqs =
>           xzalloc_array(struct pending_irq, d->arch.vgic.nr_spis);
>       if ( d->arch.vgic.pending_irqs == NULL )
> -    {
> -        xfree(d->arch.vgic.shared_irqs);
>           return -ENOMEM;
> -    }
>
>       for (i=0; i<d->arch.vgic.nr_spis; i++)
>       {
--
Julien Grall

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