[PATCH 3/4] util: reset the counters to zero

[Marc Hartmayer <mhartmay@xxxxxxxxxxxxxxxxxx>]

After freeing the data structures we have to reset the counters to
zero. This fixes a segmentation fault when virNetDevIPInfoClear is
called twice (e.g. this is possible in virDomainNetDefParseXML() if
virDomainNetIPInfoParseXML(...) fails with ret < 0 (this leads to the
first call of 'virNetDevIPInfoClear(&def->guestIP)') and the resulting
call of virDomainNetDefFree(def) in the error path of
virDomainNetDefParseXML() (this leads to the second call of
virNetDevIPInfoClear(&def->guestIP), and finally to the segmentation
fault).

Signed-off-by: Marc Hartmayer <mhartmay@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Bjoern Walk <bwalk@xxxxxxxxxxxxxxxxxx>
---
 src/util/virnetdevip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/util/virnetdevip.c b/src/util/virnetdevip.c
index d159760..42fbba1 100644
--- a/src/util/virnetdevip.c
+++ b/src/util/virnetdevip.c
@@ -882,10 +882,12 @@ virNetDevIPInfoClear(virNetDevIPInfoPtr ip)
     for (i = 0; i < ip->nips; i++)
         VIR_FREE(ip->ips[i]);
     VIR_FREE(ip->ips);
+    ip->nips = 0;
 
     for (i = 0; i < ip->nroutes; i++)
         virNetDevIPRouteFree(ip->routes[i]);
     VIR_FREE(ip->routes);
+    ip->nroutes = 0;
 }
 
 
-- 
2.5.5

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