This was flagged by undefined behaviour sanitizer: memset should not be
called with NULL first argument. (memset requires first argument to be
pointer to a memory object, so passing NULL may result in an undefined
behaviour including among other things optimizer potentially removing
code paths depending on stat->xstat_count being NULL.)

Sanitizer message:

    lib/graph/graph_stats.c:473:2: runtime error: null pointer passed as
    argument 1, which is declared to never be null

To fix the issue add a check that stat->xstat_count is not NULL before
the call.

Signed-off-by: Marat Khalili <marat.khal...@huawei.com>
---
 lib/graph/graph_stats.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/graph/graph_stats.c b/lib/graph/graph_stats.c
index eac73cbf71..57cd72e7cc 100644
--- a/lib/graph/graph_stats.c
+++ b/lib/graph/graph_stats.c
@@ -470,7 +470,9 @@ cluster_node_arregate_stats(struct cluster_node *cluster, 
bool dispatch)
        uint64_t *xstat;
        uint8_t i;
 
-       memset(stat->xstat_count, 0, sizeof(uint64_t) * stat->xstat_cntrs);
+       if (stat->xstat_count != NULL)
+               memset(stat->xstat_count, 0,
+                       sizeof(uint64_t) * stat->xstat_cntrs);
        for (count = 0; count < cluster->nb_nodes; count++) {
                node = cluster->nodes[count];
 
-- 
2.43.0

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