virNetDevBandwidthEqual: Make it more robust

So far the virNetDevBandwidthEqual() expected both ->in and ->out items
to be allocated for both @a and @b compared. This is not necessary true
for all our code. For instance, running 'update-device' twice over a NIC
with the very same XML results in SIGSEGV-ing in this function.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

diff --git a/src/util/virnetdevbandwidth.c b/src/util/virnetdevbandwidth.c
index 42b0a5017dfc51558a45345e3372186e21a97e98..17f4fa3742346d5503c3c5757a88a625cf93544d 100644 (file)
--- a/src/util/virnetdevbandwidth.c
+++ b/src/util/virnetdevbandwidth.c
@@ -335,16 +335,30 @@ virNetDevBandwidthEqual(virNetDevBandwidthPtr a,
         return false;
 
     /* in */
-    if (a->in->average != b->in->average ||
-        a->in->peak != b->in->peak ||
-        a->in->burst != b->in->burst)
+    if (a->in) {
+        if (!b->in)
+            return false;
+
+        if (a->in->average != b->in->average ||
+            a->in->peak != b->in->peak ||
+            a->in->burst != b->in->burst)
+            return false;
+    } else if (b->in) {
         return false;
+    }
 
     /*out*/
-    if (a->out->average != b->out->average ||
-        a->out->peak != b->out->peak ||
-        a->out->burst != b->out->burst)
+    if (a->out) {
+        if (!b->out)
+            return false;
+
+        if (a->out->average != b->out->average ||
+            a->out->peak != b->out->peak ||
+            a->out->burst != b->out->burst)
+            return false;
+    } else if (b->out) {
         return false;
+    }
 
     return true;
 }