diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 5c64927bf2b3..9a66e5826f25 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -2657,13 +2657,14 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
 {
 	int error = buffer_len;
 	size_t avail_len = buffer_len;
-	char *cp0 = head->write_buf;
+	char *cp0;
 	int idx;
 
 	if (!head->write)
 		return -EINVAL;
 	if (mutex_lock_interruptible(&head->io_sem))
 		return -EINTR;
+	cp0 = head->write_buf;
 	head->read_user_buf_avail = 0;
 	idx = tomoyo_read_lock();
 	/* Read a line and dispatch it to the policy handler. */