[libvirt] [PATCH] free buf->content when vsnprintf() failed
Wen Congyang
wency at cn.fujitsu.com
Wed Apr 27 05:19:47 UTC 2011
At 04/26/2011 11:43 PM, Laine Stump Write:
> On 04/25/2011 11:42 PM, Wen Congyang wrote:
>> When buf->error is 1, we do not return buf->content in the function
>> virBufferContentAndReset(). So we should free buf->content when
>> vsnprintf() failed.
>>
>> ---
>> src/util/buf.c | 6 ++++++
>> 1 files changed, 6 insertions(+), 0 deletions(-)
>>
>> diff --git a/src/util/buf.c b/src/util/buf.c
>> index 7557ad1..fdb7660 100644
>> --- a/src/util/buf.c
>> +++ b/src/util/buf.c
>> @@ -241,6 +241,9 @@ virBufferVSprintf(const virBufferPtr buf, const
>> char *format, ...)
>> size = buf->size - buf->use;
>> if ((count = vsnprintf(&buf->content[buf->use],
>> size, format, argptr))< 0) {
>> + VIR_FREE(buf->content);
>> + buf->size = 0;
>> + buf->use = 0;
>> buf->error = 1;
>
> These four lines are equivalent to calling virBufferNoMemory(buf). It
> would be more compact to do that instead. (as a matter of fact,
> virBufferNoMemory is the only other place that buf->error is ever set to
> 1, so it really is a "virBufferSetError() function).
Yes, virBufferNoMemory() is the only place that buf->error is set to 1 now.
I will rename it and update this patch.
Thaks for reviewing.
Wen Congyang
>
>
>> goto err;
>> }
>> @@ -259,6 +262,9 @@ virBufferVSprintf(const virBufferPtr buf, const
>> char *format, ...)
>> size = buf->size - buf->use;
>> if ((count = vsnprintf(&buf->content[buf->use],
>> size, format, argptr))< 0) {
>> + VIR_FREE(buf->content);
>> + buf->size = 0;
>> + buf->use = 0;
>> buf->error = 1;
>> goto err;
>> }
>
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