[TWSK]: Grab the module refcount for timewait sockets

This is required to avoid unloading a module that has active timewait
sockets, such as DCCP.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 4ade56ef3a4d..28f7b2103505 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -19,6 +19,7 @@
 
 #include <linux/ip.h>
 #include <linux/list.h>
+#include <linux/module.h>
 #include <linux/timer.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
@@ -193,11 +194,13 @@ static inline u32 inet_rcv_saddr(const struct sock *sk)
 static inline void inet_twsk_put(struct inet_timewait_sock *tw)
 {
         if (atomic_dec_and_test(&tw->tw_refcnt)) {
+                struct module *owner = tw->tw_prot->owner;
 #ifdef SOCK_REFCNT_DEBUG
                 printk(KERN_DEBUG "%s timewait_sock %p released\n",
                        tw->tw_prot->name, tw);
 #endif
                 kmem_cache_free(tw->tw_prot->twsk_slab, tw);
+                module_put(owner);
         }
 }