Re: [PATCH] xen/irq: Propagate the error from init_one_desc_irq() in init_irq_data()

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 19 Nov 2020, Julien Grall wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
> 
> init_one_desc_irq() can return an error if it is unable to allocate
> memory. While this is unlikely to happen during boot (called from
> init_irq_data()), it is better to harden the code by propagting the
> return value.
> 
> Spotted by coverity.
> 
> CID: 106529
> 
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>

Hi Julien,

Thanks for the patch. I was about to commit it when I realized there is
one more caller: xen/arch/arm/irq.c:init_local_irq_data

Should we change that too to check for the return error?


> ---
>  xen/arch/arm/irq.c | 7 ++++++-
>  xen/arch/x86/irq.c | 7 ++++++-
>  2 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/xen/arch/arm/irq.c b/xen/arch/arm/irq.c
> index 3877657a5277..279d221a2b85 100644
> --- a/xen/arch/arm/irq.c
> +++ b/xen/arch/arm/irq.c
> @@ -88,7 +88,12 @@ static int __init init_irq_data(void)
>      for ( irq = NR_LOCAL_IRQS; irq < NR_IRQS; irq++ )
>      {
>          struct irq_desc *desc = irq_to_desc(irq);
> -        init_one_irq_desc(desc);
> +        int rc;
> +
> +        rc = init_one_irq_desc(desc);
> +        if ( rc )
> +            return rc;
> +
>          desc->irq = irq;
>          desc->action  = NULL;
>      }
> diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
> index 45966947919e..3ebd684415ac 100644
> --- a/xen/arch/x86/irq.c
> +++ b/xen/arch/x86/irq.c
> @@ -428,9 +428,14 @@ int __init init_irq_data(void)
>  
>      for ( irq = 0; irq < nr_irqs_gsi; irq++ )
>      {
> +        int rc;
> +
>          desc = irq_to_desc(irq);
>          desc->irq = irq;
> -        init_one_irq_desc(desc);
> +
> +        rc = init_one_irq_desc(desc);
> +        if ( rc )
> +            return rc;
>      }
>      for ( ; irq < nr_irqs; irq++ )
>          irq_to_desc(irq)->irq = irq;
> -- 
> 2.17.1
>