Re: [Xen-devel] [RFC 3/6] Introduce _xrealloc

["Goel, Sameer" <sgoel@xxxxxxxxxxxxxx>]

On 6/9/2017 3:44 AM, Wei Liu wrote:
> On Thu, Jun 08, 2017 at 08:49:01PM +0100, Julien Grall wrote:
>> CC the REST maintainers
>>
>> On 08/06/2017 20:30, Sameer Goel wrote:
>>> Introduce a memory realloc function.
>>>
>>> Signed-off-by: Sameer Goel <sgoel@xxxxxxxxxxxxxx>
>>> ---
>>>  xen/common/xmalloc_tlsf.c | 13 +++++++++++++
>>>  xen/include/xen/xmalloc.h |  1 +
>>>  2 files changed, 14 insertions(+)
>>>
>>> diff --git a/xen/common/xmalloc_tlsf.c b/xen/common/xmalloc_tlsf.c
>>> index b256dc5..52385a8 100644
>>> --- a/xen/common/xmalloc_tlsf.c
>>> +++ b/xen/common/xmalloc_tlsf.c
>>> @@ -612,6 +612,19 @@ void *_xzalloc(unsigned long size, unsigned long align)
>>>      return p ? memset(p, 0, size) : p;
>>>  }
>>>
>>> +void *_xrealloc(void *p, unsigned long new_size, unsigned long align)
>>> +{
>>> +    void *new_p = _xmalloc(new_size, align);
>>> +
>>> +    if(new_p && p)
>>
>> Coding style: if ( ... )
>>
>>> +    {
>>> +        memcpy(new_p, p, new_size);
> 
> This is wrong. How can you know if the area pointed to by p is at least
> new_size bytes long?
> 
Agreed, I revisited the code and will remove _xrealloc and use xfree and 
_xmalloc instead.

Thanks,
Sameer
-- 
 Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, 
Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux 
Foundation Collaborative Project.

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