[PATCH 1/6]NET:AX25:ROSE Add device use count

[Richard Stearn]

Subject: [PATCH 1/6]NET:AX25:ROSE Add device use count
Adds device use count for core of protocol.
Prevents kernel crash on device shutdown.

Signed-off-by: Richard Stearn <rich...@rns-stearn.demon.co.uk>
---
 net/rose/af_rose.c       |    7 ++++++-
 net/rose/rose_loopback.c |    1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 36dbc2d..89745aa 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -687,8 +687,10 @@ static int rose_bind(struct socket *sock, struct sockaddr 
*uaddr, int addr_len)
                rose->source_call = user->call;
                ax25_uid_put(user);
        } else {
-               if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE))
+               if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
+                       dev_put(dev);
                        return -EACCES;
+               }
                rose->source_call   = *source;
        }
 
@@ -709,6 +711,7 @@ static int rose_bind(struct socket *sock, struct sockaddr 
*uaddr, int addr_len)
        rose_insert_socket(sk);
 
        sock_reset_flag(sk, SOCK_ZAPPED);
+       dev_put(dev);
 
        return 0;
 }
@@ -785,6 +788,7 @@ static int rose_connect(struct socket *sock, struct 
sockaddr *uaddr, int addr_le
 
                user = ax25_findbyuid(current_euid());
                if (!user) {
+                       dev_put(dev);
                        err = -EINVAL;
                        goto out_release;
                }
@@ -794,6 +798,7 @@ static int rose_connect(struct socket *sock, struct 
sockaddr *uaddr, int addr_le
                rose->device      = dev;
                ax25_uid_put(user);
 
+               dev_put(dev);
                rose_insert_socket(sk);         /* Finish the bind */
        }
        rose->dest_addr   = addr->srose_addr;
diff --git a/net/rose/rose_loopback.c b/net/rose/rose_loopback.c
index 3444562..ea48cee 100644
--- a/net/rose/rose_loopback.c
+++ b/net/rose/rose_loopback.c
@@ -102,6 +102,7 @@ static void rose_loopback_timer(unsigned long param)
                        if ((dev = rose_dev_get(dest)) != NULL) {
                                if (rose_rx_call_request(skb, dev, 
rose_loopback_neigh, lci_o) == 0)
                                        kfree_skb(skb);
+                               dev_put(dev);
                        } else {
                                kfree_skb(skb);
                        }