Re: [Xen-devel] [Xen HV PATCH] VT-d: Fix resource leaks on error paths

[Keir Fraser <keir@xxxxxxx>]

Will need an Ack from a VT-d maintainer (Allen Kay is listed in our
MAINTAINERS file, and is CC'ed). Also needs a Signed-off-by line.

 -- Keir

On 11/05/2011 12:45, "Igor Mammedov" <imammedo@xxxxxxxxxx> wrote:

>       On error exit from function, maped pages should be unmapped
>       and acquired locks released.
> 
> diff -r 4b0692880dfa -r da93d9e43b3c xen/drivers/passthrough/vtd/intremap.c
> --- a/xen/drivers/passthrough/vtd/intremap.c Thu May 05 17:40:34 2011 +0100
> +++ b/xen/drivers/passthrough/vtd/intremap.c Wed May 11 12:29:54 2011 +0200
> @@ -210,7 +210,8 @@
>      if ( iremap_entries )
>          unmap_vtd_domain_page(iremap_entries);
>  
> -    ir_ctrl->iremap_num++;
> +    if ( i < IREMAP_ENTRY_NR )
> +     ir_ctrl->iremap_num++;
>      return i;
>  }
>  
> @@ -246,6 +247,8 @@
>          dprintk(XENLOG_ERR VTDPREFIX,
>                  "%s: index (%d) get an empty entry!\n",
>                  __func__, index);
> + unmap_vtd_domain_page(iremap_entries);
> + spin_unlock_irqrestore(&ir_ctrl->iremap_lock, flags);
>          return -EFAULT;
>      }
>  
> @@ -281,7 +284,8 @@
>      if ( index < 0 )
>      {
>          index = alloc_remap_entry(iommu);
> -        apic_pin_2_ir_idx[apic][ioapic_pin] = index;
> +        if ( index < IREMAP_ENTRY_NR )
> +            apic_pin_2_ir_idx[apic][ioapic_pin] = index;
>      }
>  
>      if ( index > IREMAP_ENTRY_NR - 1 )
> @@ -546,6 +550,8 @@
>          dprintk(XENLOG_ERR VTDPREFIX,
>                  "%s: index (%d) get an empty entry!\n",
>                  __func__, index);
> + unmap_vtd_domain_page(iremap_entries);
> + spin_unlock_irqrestore(&ir_ctrl->iremap_lock, flags);
>          return -EFAULT;
>      }
>  
> 
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