Re: [Xen-devel] [PATCH] xen/xenoprof: avoid division by 0

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 15/02/2013 08:10, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

>>>> On 14.02.13 at 18:10, Tim Deegan <tim@xxxxxxx> wrote:
>> # HG changeset patch
>> # Parent 5a84cc531072378e6e5ff89b4c0e9a35000dc56f
>> xen/xenoprof: avoid division by 0.
>> 
>> Signed-off-by: Tim Deegan <tim@xxxxxxx>
> 
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Keir Fraser <keir@xxxxxxx>

>> diff -r 5a84cc531072 xen/common/xenoprof.c
>> --- a/xen/common/xenoprof.c Thu Feb 14 15:46:56 2013 +0000
>> +++ b/xen/common/xenoprof.c Thu Feb 14 17:07:41 2013 +0000
>> @@ -193,6 +193,13 @@ static int alloc_xenoprof_struct(
>>      unsigned max_max_samples;
>>      int i;
>>  
>> +    nvcpu = 0;
>> +    for_each_vcpu ( d, v )
>> +        nvcpu++;
>> +
>> +    if ( !nvcpu )
>> +        return -EINVAL;
>> +
>>      d->xenoprof = xzalloc(struct xenoprof);
>>      if ( d->xenoprof == NULL )
>>      {
>> @@ -209,10 +216,6 @@ static int alloc_xenoprof_struct(
>>          return -ENOMEM;
>>      }
>>  
>> -    nvcpu = 0;
>> -    for_each_vcpu ( d, v )
>> -        nvcpu++;
>> -
>>      bufsize = sizeof(struct xenoprof_buf);
>>      i = sizeof(struct event_log);
>>  #ifdef CONFIG_COMPAT
> 
> 
> 
> 
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