[PATCH] libxl: only free vcpu info list when it is allocated

[Wei Liu <wei.liu2@citrix.com>]

Clang complains nr_dom_vcpus may be used uninitialized after
4a6070ea9.

The real issue is vinfo can be NULL and nr_dom_vcpus remains
uninitialized if previous call fails.

Instead of initializing nr_dom_vcpus to 0, check if vinfo is NULL before
calling the free function, because that function can't handle NULL. That
should also placate Clang.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Dario Faggioli <dario.faggioli@citrix.com>
Cc: Juergen Gross <jgross@suse.com>
---
 tools/libxl/libxl_numa.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/libxl_numa.c b/tools/libxl/libxl_numa.c
index fd64c22..0bdac2a 100644
--- a/tools/libxl/libxl_numa.c
+++ b/tools/libxl/libxl_numa.c
@@ -254,7 +254,8 @@ static int nr_vcpus_on_nodes(libxl__gc *gc, libxl_cputopology *tinfo,
 
  next:
         libxl_cpupoolinfo_dispose(&cpupool_info);
-        libxl_vcpuinfo_list_free(vinfo, nr_dom_vcpus);
+        if (vinfo)
+            libxl_vcpuinfo_list_free(vinfo, nr_dom_vcpus);
     }
 
     libxl_bitmap_dispose(&dom_nodemap);
-- 
2.1.4


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