swap_perc: check for division by zero

diff --git a/components/swap.c b/components/swap.c
index c005691..465ffd4 100644 (file)
--- a/components/swap.c
+++ b/components/swap.c
@@ -76,6 +76,10 @@
                }
                sscanf(match, "SwapFree: %ld kB\n", &free);
 
+               if (total == 0) {
+                       return NULL;
+               }
+
                return bprintf("%d%%", 100 * (total - free - cached) / total);
        }