diff --git a/sys-utils/ipcmk.c b/sys-utils/ipcmk.c
index 0a84be77e..d6e5ce6c9 100644
--- a/sys-utils/ipcmk.c
+++ b/sys-utils/ipcmk.c
@@ -122,9 +122,14 @@ int main(int argc, char **argv)
 			ask_sem = 1;
 			break;
 		case 'p':
+		{
+			char *end = NULL;
+			errno = 0;
 			permission = strtoul(optarg, NULL, 8);
+			if (errno || optarg == end || (end && *end))
+				err(EXIT_FAILURE, _("failed to parse mode"));
 			break;
-
+		}
 		case 'h':
 			usage();
 		case 'V':
diff --git a/sys-utils/ipcrm.c b/sys-utils/ipcrm.c
index 5a27b7d20..52768a242 100644
--- a/sys-utils/ipcrm.c
+++ b/sys-utils/ipcrm.c
@@ -125,12 +125,13 @@ static int remove_id(int type, int iskey, int id)
 static int remove_arg_list(type_id type, int argc, char **argv)
 {
 	int id;
-	char *end;
+	char *end = NULL;
 	int nb_errors = 0;
 
 	do {
+		errno = 0;
 		id = strtoul(argv[0], &end, 10);
-		if (*end != 0) {
+		if (errno || !end || *end != 0) {
 			warnx(_("invalid id: %s"), argv[0]);
 			nb_errors++;
 		} else {