diff -purN linux-2.4.29-hf11/Makefile linux-2.4.29-hf12/Makefile
--- linux-2.4.29-hf11/Makefile	Sat Jul 16 23:20:00 2005
+++ linux-2.4.29-hf12/Makefile	Sat Jul 16 23:20:00 2005
@@ -1,7 +1,7 @@
 VERSION = 2
 PATCHLEVEL = 4
 SUBLEVEL = 29
-EXTRAVERSION = -hf11
+EXTRAVERSION = -hf12
 
 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 
diff -purN linux-2.4.29-hf11/drivers/char/cyclades.c linux-2.4.29-hf12/drivers/char/cyclades.c
--- linux-2.4.29-hf11/drivers/char/cyclades.c	Wed Dec 22 22:26:14 2004
+++ linux-2.4.29-hf12/drivers/char/cyclades.c	Sat Jul 16 23:20:00 2005
@@ -2960,10 +2960,15 @@ static int
 cy_write(struct tty_struct * tty, int from_user,
            const unsigned char *buf, int count)
 {
-  struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
+  struct cyclades_port *info;
   unsigned long flags;
   int c, ret = 0;
 
+    if (!tty)
+	return 0;
+
+    info = (struct cyclades_port *)tty->driver_data;
+  
 #ifdef CY_DEBUG_IO
     printk("cyc:cy_write ttyC%d\n", info->line); /* */
 #endif
@@ -2972,7 +2977,7 @@ cy_write(struct tty_struct * tty, int fr
         return 0;
     }
         
-    if (!tty || !info->xmit_buf || !tmp_buf){
+    if (!info->xmit_buf || !tmp_buf){
         return 0;
     }
 
@@ -3047,9 +3052,14 @@ cy_write(struct tty_struct * tty, int fr
 static void
 cy_put_char(struct tty_struct *tty, unsigned char ch)
 {
-  struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
+  struct cyclades_port *info;
   unsigned long flags;
 
+    if (!tty)
+        return;
+
+    info = (struct cyclades_port *)tty->driver_data;
+  
 #ifdef CY_DEBUG_IO
     printk("cyc:cy_put_char ttyC%d\n", info->line);
 #endif
@@ -3057,7 +3067,7 @@ cy_put_char(struct tty_struct *tty, unsi
     if (serial_paranoia_check(info, tty->device, "cy_put_char"))
         return;
 
-    if (!tty || !info->xmit_buf)
+    if (!info->xmit_buf)
         return;
 
     CY_LOCK(info, flags);
diff -purN linux-2.4.29-hf11/drivers/char/esp.c linux-2.4.29-hf12/drivers/char/esp.c
--- linux-2.4.29-hf11/drivers/char/esp.c	Wed Dec 22 22:26:14 2004
+++ linux-2.4.29-hf12/drivers/char/esp.c	Sat Jul 16 23:20:00 2005
@@ -1251,13 +1251,18 @@ static void change_speed(struct esp_stru
 
 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
 {
-	struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+	struct esp_struct *info;
 	unsigned long flags;
 
+	if (!tty)
+		return;
+
+	info = (struct esp_struct *)tty->driver_data;
+	
 	if (serial_paranoia_check(info, tty->device, "rs_put_char"))
 		return;
 
-	if (!tty || !info->xmit_buf)
+	if (!info->xmit_buf)
 		return;
 
 	save_flags(flags); cli();
@@ -1296,13 +1301,19 @@ static int rs_write(struct tty_struct * 
 		    const unsigned char *buf, int count)
 {
 	int	c, t, ret = 0;
-	struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+	struct esp_struct *info;
 	unsigned long flags;
 
+
+	if (!tty)
+		return 0;
+	
+	info = (struct esp_struct *)tty->driver_data;
+
 	if (serial_paranoia_check(info, tty->device, "rs_write"))
 		return 0;
 
-	if (!tty || !info->xmit_buf || !tmp_buf)
+	if (!info->xmit_buf || !tmp_buf)
 		return 0;
 	    
 	if (from_user)
diff -purN linux-2.4.29-hf11/drivers/char/isicom.c linux-2.4.29-hf12/drivers/char/isicom.c
--- linux-2.4.29-hf11/drivers/char/isicom.c	Wed Dec 22 22:26:14 2004
+++ linux-2.4.29-hf12/drivers/char/isicom.c	Sat Jul 16 23:20:00 2005
@@ -1223,9 +1223,15 @@ static void isicom_close(struct tty_stru
 static int isicom_write(struct tty_struct * tty, int from_user,
 			const unsigned char * buf, int count)
 {
-	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_port * port;
 	unsigned long flags;
 	int cnt, total = 0;
+
+	if (!tty)
+		return 0;
+	
+	port = (struct isi_port *) tty->driver_data;
+	
 #ifdef ISICOM_DEBUG
 	printk(KERN_DEBUG "ISICOM: isicom_write for port%d: %d bytes.\n",
 			port->channel+1, count);
@@ -1233,7 +1239,7 @@ static int isicom_write(struct tty_struc
 	if (isicom_paranoia_check(port, tty->device, "isicom_write"))
 		return 0;
 	
-	if (!tty || !port->xmit_buf || !tmp_buf)
+	if (!port->xmit_buf || !tmp_buf)
 		return 0;
 	if (from_user)
 		down(&tmp_buf_sem); /* acquire xclusive access to tmp_buf */
@@ -1281,13 +1287,18 @@ static int isicom_write(struct tty_struc
 /* put_char et all */
 static void isicom_put_char(struct tty_struct * tty, unsigned char ch)
 {
-	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_port * port;
 	unsigned long flags;
+
+	if (!tty)
+		return;
+
+	port = (struct isi_port *) tty->driver_data;
 	
 	if (isicom_paranoia_check(port, tty->device, "isicom_put_char"))
 		return;
 	
-	if (!tty || !port->xmit_buf)
+	if (!port->xmit_buf)
 		return;
 #ifdef ISICOM_DEBUG
 	printk(KERN_DEBUG "ISICOM: put_char, port %d, char %c.\n", port->channel+1, ch);
diff -purN linux-2.4.29-hf11/drivers/char/mxser.c linux-2.4.29-hf12/drivers/char/mxser.c
--- linux-2.4.29-hf11/drivers/char/mxser.c	Wed Dec 22 22:26:14 2004
+++ linux-2.4.29-hf12/drivers/char/mxser.c	Sat Jul 16 23:20:00 2005
@@ -911,10 +911,15 @@ static int mxser_write(struct tty_struct
 		       const unsigned char *buf, int count)
 {
 	int c, total = 0;
-	struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
+	struct mxser_struct *info;
 	unsigned long flags;
 
-	if (!tty || !info->xmit_buf || !mxvar_tmp_buf)
+	if (!tty)
+		return (0);
+	
+	info = (struct mxser_struct *) tty->driver_data;
+	
+	if (!info->xmit_buf || !mxvar_tmp_buf)
 		return (0);
 
 	save_flags(flags);
@@ -979,10 +984,15 @@ static int mxser_write(struct tty_struct
 
 static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
 {
-	struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
+	struct mxser_struct *info;
 	unsigned long flags;
 
-	if (!tty || !info->xmit_buf)
+	if (!tty)
+		return;
+
+	info = (struct mxser_struct *) tty->driver_data;
+	
+	if (!info->xmit_buf)
 		return;
 
 	save_flags(flags);
diff -purN linux-2.4.29-hf11/drivers/char/riscom8.c linux-2.4.29-hf12/drivers/char/riscom8.c
--- linux-2.4.29-hf11/drivers/char/riscom8.c	Wed Dec 22 22:26:14 2004
+++ linux-2.4.29-hf12/drivers/char/riscom8.c	Sat Jul 16 23:20:00 2005
@@ -1220,17 +1220,22 @@ out:	restore_flags(flags);
 static int rc_write(struct tty_struct * tty, int from_user, 
 		    const unsigned char *buf, int count)
 {
-	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_port *port;
 	struct riscom_board *bp;
 	int c, total = 0;
 	unsigned long flags;
+
+	if (!tty)
+		return 0;
+
+	port = (struct riscom_port *)tty->driver_data;
 				
 	if (rc_paranoia_check(port, tty->device, "rc_write"))
 		return 0;
 	
 	bp = port_Board(port);
 
-	if (!tty || !port->xmit_buf || !tmp_buf)
+	if (!port->xmit_buf || !tmp_buf)
 		return 0;
 
 	save_flags(flags);
@@ -1298,13 +1303,18 @@ static int rc_write(struct tty_struct * 
 
 static void rc_put_char(struct tty_struct * tty, unsigned char ch)
 {
-	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_port *port;
 	unsigned long flags;
 
+	if (!tty)
+		return;
+
+	port = (struct riscom_port *)tty->driver_data;
+
 	if (rc_paranoia_check(port, tty->device, "rc_put_char"))
 		return;
 
-	if (!tty || !port->xmit_buf)
+	if (!port->xmit_buf)
 		return;
 
 	save_flags(flags); cli();
diff -purN linux-2.4.29-hf11/drivers/char/specialix.c linux-2.4.29-hf12/drivers/char/specialix.c
--- linux-2.4.29-hf11/drivers/char/specialix.c	Wed Dec 22 22:26:14 2004
+++ linux-2.4.29-hf12/drivers/char/specialix.c	Sat Jul 16 23:20:00 2005
@@ -1600,17 +1600,22 @@ static void sx_close(struct tty_struct *
 static int sx_write(struct tty_struct * tty, int from_user, 
                     const unsigned char *buf, int count)
 {
-	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_port *port;
 	struct specialix_board *bp;
 	int c, total = 0;
 	unsigned long flags;
+
+	if (!tty)
+		return 0;
+
+	port = (struct specialix_port *)tty->driver_data;
 				
 	if (sx_paranoia_check(port, tty->device, "sx_write"))
 		return 0;
 	
 	bp = port_Board(port);
 
-	if (!tty || !port->xmit_buf || !tmp_buf)
+	if (!port->xmit_buf || !tmp_buf)
 		return 0;
 
 	save_flags(flags);
@@ -1676,13 +1681,18 @@ static int sx_write(struct tty_struct * 
 
 static void sx_put_char(struct tty_struct * tty, unsigned char ch)
 {
-	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_port *port;
 	unsigned long flags;
 
+	if (!tty)
+		return;
+
+	port = (struct specialix_port *)tty->driver_data;
+
 	if (sx_paranoia_check(port, tty->device, "sx_put_char"))
 		return;
 
-	if (!tty || !port->xmit_buf)
+	if (!port->xmit_buf)
 		return;
 
 	save_flags(flags); cli();
diff -purN linux-2.4.29-hf11/net/netlink/af_netlink.c linux-2.4.29-hf12/net/netlink/af_netlink.c
--- linux-2.4.29-hf11/net/netlink/af_netlink.c	Sat Jul 16 23:20:00 2005
+++ linux-2.4.29-hf12/net/netlink/af_netlink.c	Sat Jul 16 23:20:00 2005
@@ -330,9 +330,9 @@ static void netlink_remove(struct sock *
 	u32 pid = nlk_sk(sk)->pid;
 
 	netlink_table_grab();
+	hash->entries--;
 	for (skp = nl_pid_hashfn(hash, pid); *skp; skp = &((*skp)->next)) {
 		if (*skp == sk) {
-			hash->entries--;
 			*skp = sk->next;
 			__sock_put(sk);
 			break;
@@ -450,7 +450,7 @@ retry:
 	err = netlink_insert(sk, pid);
 	if (err == -EADDRINUSE)
 		goto retry;
-	return err;
+	return 0;
 }
 
 static inline int netlink_capable(struct socket *sock, unsigned int flag)