@@ -4365,7 +4365,6 @@ static struct addrconf_sysctl_table
{
struct ctl_table_header *sysctl_header;
ctl_table addrconf_vars[DEVCONF_MAX+1];
- char *dev_name;
} addrconf_sysctl __read_mostly = {
.sysctl_header = NULL,
.addrconf_vars = {
@@ -4594,17 +4593,7 @@ static int __addrconf_sysctl_register(struct net *net, char *dev_name,
{
int i;
struct addrconf_sysctl_table *t;
-
-#define ADDRCONF_CTL_PATH_DEV 3
-
- struct ctl_path addrconf_ctl_path[] = {
- { .procname = "net", },
- { .procname = "ipv6", },
- { .procname = "conf", },
- { /* to be set */ },
- { },
- };
-
+ char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
if (t == NULL)
@@ -4616,27 +4605,15 @@ static int __addrconf_sysctl_register(struct net *net, char *dev_name,
t->addrconf_vars[i].extra2 = net;
}
- /*
- * Make a copy of dev_name, because '.procname' is regarded as const
- * by sysctl and we wouldn't want anyone to change it under our feet
- * (see SIOCSIFNAME).
- */
- t->dev_name = kstrdup(dev_name, GFP_KERNEL);
- if (!t->dev_name)
- goto free;
+ snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
- addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
-
- t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
- t->addrconf_vars);
+ t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
if (t->sysctl_header == NULL)
- goto free_procname;
+ goto free;
p->sysctl = t;
return 0;
-free_procname:
- kfree(t->dev_name);
free:
kfree(t);
out:
@@ -4653,7 +4630,6 @@ static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
t = p->sysctl;
p->sysctl = NULL;
unregister_net_sysctl_table(t->sysctl_header);
- kfree(t->dev_name);
kfree(t);
}
Using an ascii path to register_net_sysctl as opposed to the slightly awkward ctl_path allows for much simpler code. We no longer need to malloc dev_name to keep it alive the length of our sysctl register instead we can use a small temporary buffer on the stack. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> --- net/ipv6/addrconf.c | 32 ++++---------------------------- 1 files changed, 4 insertions(+), 28 deletions(-)