[libvirt] [PATCH 2/6] qemu: Plug memory leak on qemuProcessWaitForMonitor() error path

[Wen Congyang]

At 11/30/2011 02:32 PM, Alex Jia Write:
> On 11/30/2011 02:20 PM, Wen Congyang wrote:
>> At 11/30/2011 01:57 PM, ajia at redhat.com Write:
>>> From: Alex Jia<ajia at redhat.com>
>>>
>>> Detected by Coverity. Leak introduced in commit 109efd7.
>>>
>>> Signed-off-by: Alex Jia<ajia at redhat.com>
>>> ---
>>>   src/qemu/qemu_process.c |    1 +
>>>   1 files changed, 1 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
>>> index 2563f97..f3f44ca 100644
>>> --- a/src/qemu/qemu_process.c
>>> +++ b/src/qemu/qemu_process.c
>>> @@ -1224,6 +1224,7 @@ qemuProcessWaitForMonitor(struct qemud_driver*
>>> driver,
>>>
>>>           if (VIR_ALLOC_N(buf, buf_size)<  0) {
>>>               virReportOOMError();
>>> +            VIR_FORCE_CLOSE(logfd);
>>>               return -1;
>> I think it is better to goto closelog
> Yeah, I think so before, but 'closelog' label will free 'buf', in fact,
> we haven't successfully allocate

buf is inited to NULL, so it is safe to use VIR_FREE(buf)

> memory to 'buf' variable, I'm not sure whether it is a issue. maybe, the
> above is a simple way, otherwise, it should be better if we add a check
> for 'buf' variable in 'closelog' label, it looks like this:
> ...
> if (buf)
>      VIR_FREE(buf);

If buf is NULL, VIR_FREE(bus) does nothing and is safe.
If you add a check for 'buf', make syntax-check will fail.

Thansk
Wen Congyang

> ...
> 
> Chongyang, please correct me if I'm wrong :)
> 
> Thanks,
> Alex
>> Thanks
>> Wen Congyang
>>
>>>           }
>>
> 
>