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[AX.25]: Fix unchecked ax25_protocol_register uses. 

Replace ax25_protocol_register by ax25_register_pid which assumes the
caller has done the memory allocation.  This allows replacing the
kmalloc allocations entirely by static allocations.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ralf Baechle 2006-12-14 15:50:01 -08:00 committed by David S. Miller
parent c9266b99e2
commit 8d5cf596d1
4 changed files with 32 additions and 32 deletions
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9
include/net/ax25.h
View File

@ -333,7 +333,14 @@ extern void ax25_ds_t3timer_expiry(ax25_cb *);
extern void ax25_ds_idletimer_expiry(ax25_cb *);
/* ax25_iface.c */
extern int __must_check ax25_protocol_register(unsigned int, int (*)(struct sk_buff *, ax25_cb *));
struct ax25_protocol {
struct ax25_protocol *next;
unsigned int pid;
int (*func)(struct sk_buff *, ax25_cb *);
};
extern void ax25_register_pid(struct ax25_protocol *ap);
extern void ax25_protocol_release(unsigned int);
extern int __must_check ax25_linkfail_register(void (*)(ax25_cb *, int));
extern void ax25_linkfail_release(void (*)(ax25_cb *, int));

41
net/ax25/ax25_iface.c
View File

@ -29,11 +29,7 @@
#include <linux/mm.h>
#include <linux/interrupt.h>
static struct protocol_struct {
struct protocol_struct *next;
unsigned int pid;
int (*func)(struct sk_buff *, ax25_cb *);
} *protocol_list = NULL;
static struct ax25_protocol *protocol_list;
static DEFINE_RWLOCK(protocol_list_lock);
static struct linkfail_struct {
@ -49,36 +45,23 @@ static struct listen_struct {
} *listen_list = NULL;
static DEFINE_SPINLOCK(listen_lock);
int ax25_protocol_register(unsigned int pid,
int (*func)(struct sk_buff *, ax25_cb *))
/*
* Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
* AX25_P_IP or AX25_P_ARP ...
*/
void ax25_register_pid(struct ax25_protocol *ap)
{
struct protocol_struct *protocol;
if (pid == AX25_P_TEXT || pid == AX25_P_SEGMENT)
return 0;
#ifdef CONFIG_INET
if (pid == AX25_P_IP || pid == AX25_P_ARP)
return 0;
#endif
if ((protocol = kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL)
return 0;
protocol->pid = pid;
protocol->func = func;
write_lock_bh(&protocol_list_lock);
protocol->next = protocol_list;
protocol_list = protocol;
ap->next = protocol_list;
protocol_list = ap;
write_unlock_bh(&protocol_list_lock);
return 1;
}
EXPORT_SYMBOL(ax25_protocol_register);
EXPORT_SYMBOL_GPL(ax25_register_pid);
void ax25_protocol_release(unsigned int pid)
{
struct protocol_struct *s, *protocol;
struct ax25_protocol *s, *protocol;
write_lock_bh(&protocol_list_lock);
protocol = protocol_list;
@ -223,7 +206,7 @@ EXPORT_SYMBOL(ax25_listen_release);
int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
{
int (*res)(struct sk_buff *, ax25_cb *) = NULL;
struct protocol_struct *protocol;
struct ax25_protocol *protocol;
read_lock(&protocol_list_lock);
for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
@ -263,7 +246,7 @@ void ax25_link_failed(ax25_cb *ax25, int reason)
int ax25_protocol_is_registered(unsigned int pid)
{
struct protocol_struct *protocol;
struct ax25_protocol *protocol;
int res = 0;
read_lock_bh(&protocol_list_lock);

7
net/netrom/af_netrom.c
View File

@ -1377,6 +1377,11 @@ static struct notifier_block nr_dev_notifier = {
static struct net_device **dev_nr;
static struct ax25_protocol nr_pid = {
.pid = AX25_P_NETROM,
.func = nr_route_frame
};
static int __init nr_proto_init(void)
{
int i;
@ -1424,7 +1429,7 @@ static int __init nr_proto_init(void)
register_netdevice_notifier(&nr_dev_notifier);
ax25_protocol_register(AX25_P_NETROM, nr_route_frame);
ax25_register_pid(&nr_pid);
ax25_linkfail_register(nr_link_failed);
#ifdef CONFIG_SYSCTL

7
net/rose/af_rose.c
View File

@ -1481,6 +1481,11 @@ static struct notifier_block rose_dev_notifier = {
static struct net_device **dev_rose;
static struct ax25_protocol rose_pid = {
.pid = AX25_P_ROSE,
.func = rose_route_frame
};
static int __init rose_proto_init(void)
{
int i;
@ -1530,7 +1535,7 @@ static int __init rose_proto_init(void)
sock_register(&rose_family_ops);
register_netdevice_notifier(&rose_dev_notifier);
ax25_protocol_register(AX25_P_ROSE, rose_route_frame);
ax25_register_pid(&rose_pid);
ax25_linkfail_register(rose_link_failed);
#ifdef CONFIG_SYSCTL