check invalid coremask

src/main.c

@@ -174,8 +174,8 @@ int expand_coremask(const char *coremask, int **cores, int *nr_cores)
 	long v, needle;
 
 	/*
-	 * This function returns array of usabe cores in `cores` and
-	 * returns the number of usabel cores (array length) through
+	 * This function returns array of usable cores in `cores` and
+	 * returns the number of usable cores (array length) through
 	 * nr_cores.
 	 */
 
@@ -214,6 +214,11 @@ int expand_coremask(const char *coremask, int **cores, int *nr_cores)
 		}
 	}
 
+	if (nr_usable < 1) {
+		pr_err("invalid core mask: %s\n", coremask);
+		return -1;
+	}
+
 	*cores = core_list;
 	*nr_cores = nr_usable;
 	return 0;