diff --git a/Monitor.c b/Monitor.c
index 240b8db..cbc5d0f 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -626,7 +626,7 @@ int Wait(char *dev)
 			free_mdstat(ms);
 			return rv;
 		}
-		free(ms);
+		free_mdstat(ms);
 		rv = 0;
 		mdstat_wait(5);
 	}
diff --git a/config.c b/config.c
index 6ab5a34..7e09b5c 100644
--- a/config.c
+++ b/config.c
@@ -600,7 +600,7 @@ void mailfromline(char *line)
 		else {
 			char *t = NULL;
 
-			if (asprintf(&t, "%s %s", alert_mail_from, w) > 0) {
+			if (xasprintf(&t, "%s %s", alert_mail_from, w) > 0) {
 				free(alert_mail_from);
 				alert_mail_from = t;
 			}
diff --git a/mapfile.c b/mapfile.c
index 75095ec..ca7072e 100644
--- a/mapfile.c
+++ b/mapfile.c
@@ -337,4 +337,5 @@ void RebuildMap(void)
 		sysfs_uevent(sra, "change");
 		sysfs_free(sra);
 	}
+	free_mdstat(mdstat);
 }
diff --git a/mdadm.c b/mdadm.c
index a0d6097..1f9b707 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1241,6 +1241,7 @@ int main(int argc, char *argv[])
 							rv |= WaitClean(name, v);
 						put_md_name(name);
 					}
+					free_mdstat(ms);
 				} else	if (devmode == 'S' && scan) {
 					/* apply --stop to all devices in /proc/mdstat */
 					/* Due to possible stacking of devices, repeat until
@@ -1273,6 +1274,7 @@ int main(int argc, char *argv[])
 
 							put_md_name(name);
 						}
+						free_mdstat(ms);
 					} while (!last && err);
 					if (err) rv |= 1;
 				} else {
diff --git a/mdadm.h b/mdadm.h
index e75648b..8220535 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -880,6 +880,17 @@ static inline int is_subarray(char *vers)
 #define dprintf(fmt, arg...) \
         ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
 #endif
+#include <assert.h>
+#include <stdarg.h>
+static inline int xasprintf(char **strp, const char *fmt, ...) {
+	va_list ap;
+	int ret;
+	va_start(ap, fmt);
+	ret = asprintf(strp, fmt, ap);
+	va_end(ap);
+	assert(ret >= 0);
+	return ret;
+}
 
 #define	LEVEL_MULTIPATH		(-4)
 #define	LEVEL_LINEAR		(-1)