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-rw-r--r--net/tipc/socket.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 9ae8e9f7402..3220d5cb5b5 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1419,7 +1419,7 @@ exit:
/**
* shutdown - shutdown socket connection
* @sock: socket structure
- * @how: direction to close (unused; always treated as read + write)
+ * @how: direction to close (must be SHUT_RDWR)
*
* Terminates connection (if necessary), then purges socket's receive queue.
*
@@ -1432,7 +1432,8 @@ static int shutdown(struct socket *sock, int how)
struct sk_buff *buf;
int res;
- /* Could return -EINVAL for an invalid "how", but why bother? */
+ if (how != SHUT_RDWR)
+ return -EINVAL;
if (mutex_lock_interruptible(&tsock->lock))
return -ERESTARTSYS;