[libvirt] [PATCH] examples: If parameters count is zero we have nothing to do

[Marc Hartmayer]

The virDomainGetCPUStats() API contract permits nparams ==
0. print_cpu_usage() assumes nparams > 0 because the domtop example
application isn't very useful if there are no statistics. Explicitly
error out to avoid potentially using the local variable pos
uninitialized.

Reviewed-by: Boris Fiuczynski <fiuczy at linux.vnet.ibm.com>
Reviewed-by: Sascha Silbe <silbe at linux.vnet.ibm.com>
Reviewed-by: Bjoern Walk <bwalk at linux.vnet.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay at linux.vnet.ibm.com>
---
 examples/domtop/domtop.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/examples/domtop/domtop.c b/examples/domtop/domtop.c
index 2283994..f8e250b 100644
--- a/examples/domtop/domtop.c
+++ b/examples/domtop/domtop.c
@@ -203,6 +203,11 @@ print_cpu_usage(const char *dom_name,
     size_t nparams = now_nparams;
     bool delim = false;
 
+    if (nparams == 0) {
+        ERROR("parameter count is zero");
+        return;
+    }
+
     if (then_nparams != now_nparams) {
         /* this should not happen (TM) */
         ERROR("parameters counts don't match");
-- 
2.5.5