diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f7b75985d542..38597f26b34c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -483,7 +483,7 @@ int proc_int_k2u_conv_kop(ulong *u_ptr, const int *k_ptr, bool *negp,
 
 	if (val < 0) {
 		*negp = true;
-		*u_ptr = k_ptr_op ? -k_ptr_op((ulong)val) : -(ulong)val;
+		*u_ptr = k_ptr_op ? k_ptr_op(-(ulong)val) : -(ulong)val;
 	} else {
 		*negp = false;
 		*u_ptr = k_ptr_op ? k_ptr_op((ulong)val) : (ulong) val;
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 80c354811538..9b3487d40cd6 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -101,6 +101,8 @@ void __init register_refined_jiffies(long cycles_per_second)
 #ifdef CONFIG_SYSCTL
 static ulong mult_hz(const ulong val)
 {
+	if (val >= ULONG_MAX / HZ)
+		return ULONG_MAX;
 	return val * HZ;
 }