[PATCH] networkRunHook: Run hook only if possible

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

Currently, networkRunHook() is called in networkAllocateActualDevice and
friends. These functions, however, doesn't necessarily work on networks,
For example, if domain's interface is defined in this fashion:

    <interface type='bridge'>
      <mac address='52:54:00:0b:3b:16'/>
      <source bridge='virbr1'/>
      <model type='rtl8139'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
    </interface>

The networkAllocateActualDevice jumps directly onto 'validate' label as
the interface is not type of 'network'. Hence, @network is left
initialized to NULL and networkRunHook(network, ...) is called. One of
the things that the hook function does is dereference @network. Soupir.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/network/bridge_driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index ee264b9..a6c719d 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -150,6 +150,12 @@ networkRunHook(virNetworkObjPtr network,
     int ret = -1;
 
     if (virHookPresent(VIR_HOOK_DRIVER_NETWORK)) {
+        if (!network) {
+            VIR_DEBUG("Not running hook as @network is NULL");
+            ret = 0;
+            goto cleanup;
+        }
+
         virBufferAddLit(&buf, "<hookData>\n");
         virBufferAdjustIndent(&buf, 2);
         if (virNetworkDefFormatBuf(&buf, network->def, 0) < 0)
-- 
1.9.0

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