write_prometheus plugin: Complete error handling in `prom_metric_family_clone()`.

diff --git a/src/write_prometheus.c b/src/write_prometheus.c
index 4861766b44d355b8fe2bc9e2d47e70e7a48fef3a..9cf2f4d833d07a919600fe2a0100770db962f073 100644 (file)
--- a/src/write_prometheus.c
+++ b/src/write_prometheus.c
@@ -665,9 +665,20 @@ prom_metric_family_clone(metric_family_t const *fam) {
 
   if (fam->help != NULL) {
     pfam->help = strdup(fam->help);
+    if (pfam->help == NULL) {
+      sfree(pfam->name);
+      sfree(pfam);
+      return NULL;
+    }
   }
   if (fam->unit != NULL) {
     pfam->unit = strdup(fam->unit);
+    if (pfam->unit == NULL) {
+      sfree(pfam->help);
+      sfree(pfam->name);
+      sfree(pfam);
+      return NULL;
+    }
   }
 
   return pfam;