diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 23f658d..93c7b02 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2503,6 +2503,8 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
 			bool neg;
 
 			left -= proc_skip_spaces(&p);
+			if (!left)
+				break;
 
 			err = proc_get_long(&p, &left, &val, &neg,
 					     proc_wspace_sep,