[libvirt] [PATCH v1 13/32] util: netdevip: use VIR_AUTOPTR for aggregate types

[Sukrit Bhatnagar]

On Fri, 3 Aug 2018 at 18:32, Erik Skultety <eskultet at redhat.com> wrote:
>
> On Sat, Jul 28, 2018 at 11:31:28PM +0530, Sukrit Bhatnagar wrote:
> > By making use of GNU C's cleanup attribute handled by the
> > VIR_AUTOPTR macro for declaring aggregate pointer variables,
> > majority of the calls to *Free functions can be dropped, which
> > in turn leads to getting rid of most of our cleanup sections.
> >
> > Signed-off-by: Sukrit Bhatnagar <skrtbhtngr at gmail.com>
> > ---
> >  src/util/virnetdevip.c | 55 +++++++++++++++++++++-----------------------------
> >  1 file changed, 23 insertions(+), 32 deletions(-)
> >
> > diff --git a/src/util/virnetdevip.c b/src/util/virnetdevip.c
> > index 8f1081b..ca206e2 100644
> > --- a/src/util/virnetdevip.c
> > +++ b/src/util/virnetdevip.c
> > @@ -634,19 +634,22 @@ virNetDevIPCheckIPv6Forwarding(void)
> >      }
> >
> >      if (!valid) {
> > -        virBuffer buf = VIR_BUFFER_INITIALIZER;
> > +        VIR_AUTOPTR(virBuffer) buf = NULL;
> > +
> > +        if (VIR_ALLOC(buf) < 0)
> > +            goto cleanup;
>
> Hmm, this will actually leak memory because @buf is never going to be freed,
> worse, we'll assign NULL to it.

But since @buf is declared as AUTOPTR, virBufferFreeAndReset will be called
when it exits the scope, right?
If I were using virBufferContentAndReset, then it might be the case.