Re: [Qemu-devel] [PATCH 8/8] vl.c: validate -numa "cpus" parameter properly

[Eric Blake <eblake@redhat.com>]

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On 01/16/2013 08:24 AM, Eduardo Habkost wrote:
> - Accept empty strings without aborting
> - Use parse_uint*() to parse numbers
> - Abort if anything except '-' or end-of-string is found after the first
>   number.
> - Check for endvalue < value
> 
> Also change the MAX_CPUMASK_BITS warning message from "A max of %d CPUs
> are supported in a guest" to "qemu: NUMA: A max of %d VCPUs are
> supported".
> 
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
> Cc: Eric Blake <eblake@redhat.com>
> ---
>  vl.c | 32 +++++++++++++++++++++++++++-----
>  1 file changed, 27 insertions(+), 5 deletions(-)
> 

>  
> -    value = strtoull(cpus, &endptr, 10);
> +    /* Empty CPU range strings will be considered valid, they will simply
> +     * not set any bit in the CPU bitmap.
> +     */
> +    if (!*cpus) {
> +        return;

Does the code behave correctly when there are no bits in the CPU bitmap,
or do you require that at least one bit be set?

> +    }
> +
> +    if (parse_uint(cpus, &value, &endptr) < 0) {
> +        goto error;

Again, another case of accepting octal where you used to only accept
binary; if the change of interpretation of 010 is intentional, it would
be worth documenting in the commit message.  Otherwise, it might be
worth refactoring 1/8 to add a 'base' parameter to parse_uint[_full] to
allow the caller to control whether they want base 0 or base 10.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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