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[INET]: Small possible memory leak in FIB rules 

This patch fixes a small memory leak. Default fib rules can be deleted by
the user if the rule does not carry FIB_RULE_PERMANENT flag, f.e. by
	ip rule flush

Such a rule will not be freed as the ref-counter has 2 on start and becomes
clearly unreachable after removal.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2007-11-10 22:12:03 -08:00 committed by David S. Miller
parent 33d36bb83c
commit 2994c63863
5 changed files with 62 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/fib_rules.h
View File

@ -107,4 +107,7 @@ extern int fib_rules_unregister(struct fib_rules_ops *);
extern int fib_rules_lookup(struct fib_rules_ops *,
struct flowi *, int flags,
struct fib_lookup_arg *);
extern int fib_default_rule_add(struct fib_rules_ops *,
u32 pref, u32 table,
u32 flags);
#endif

22
net/core/fib_rules.c
View File

@ -18,6 +18,28 @@
static LIST_HEAD(rules_ops);
static DEFINE_SPINLOCK(rules_mod_lock);
int fib_default_rule_add(struct fib_rules_ops *ops,
u32 pref, u32 table, u32 flags)
{
struct fib_rule *r;
r = kzalloc(ops->rule_size, GFP_KERNEL);
if (r == NULL)
return -ENOMEM;
atomic_set(&r->refcnt, 1);
r->action = FR_ACT_TO_TBL;
r->pref = pref;
r->table = table;
r->flags = flags;
/* The lock is not required here, the list in unreacheable
* at the moment this function is called */
list_add_tail(&r->list, &ops->rules_list);
return 0;
}
EXPORT_SYMBOL(fib_default_rule_add);
static void notify_rule_change(int event, struct fib_rule *rule,
struct fib_rules_ops *ops, struct nlmsghdr *nlh,
u32 pid);

13
net/decnet/dn_rules.c
View File

@ -48,15 +48,6 @@ struct dn_fib_rule
u8 flags;
};
static struct dn_fib_rule default_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0x7fff,
.table = RT_TABLE_MAIN,
.action = FR_ACT_TO_TBL,
},
};
int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
{
@ -262,8 +253,8 @@ static struct fib_rules_ops dn_fib_rules_ops = {
void __init dn_fib_rules_init(void)
{
list_add_tail(&default_rule.common.list,
&dn_fib_rules_ops.rules_list);
BUG_ON(fib_default_rule_add(&dn_fib_rules_ops, 0x7fff,
RT_TABLE_MAIN, 0));
fib_rules_register(&dn_fib_rules_ops);
}

51
net/ipv4/fib_rules.c
View File

@ -49,33 +49,6 @@ struct fib4_rule
#endif
};
static struct fib4_rule default_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0x7FFF,
.table = RT_TABLE_DEFAULT,
.action = FR_ACT_TO_TBL,
},
};
static struct fib4_rule main_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0x7FFE,
.table = RT_TABLE_MAIN,
.action = FR_ACT_TO_TBL,
},
};
static struct fib4_rule local_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.table = RT_TABLE_LOCAL,
.action = FR_ACT_TO_TBL,
.flags = FIB_RULE_PERMANENT,
},
};
#ifdef CONFIG_NET_CLS_ROUTE
u32 fib_rules_tclass(struct fib_result *res)
{
@ -319,11 +292,27 @@ static struct fib_rules_ops fib4_rules_ops = {
.owner = THIS_MODULE,
};
static int __init fib_default_rules_init(void)
{
int err;
err = fib_default_rule_add(&fib4_rules_ops, 0,
RT_TABLE_LOCAL, FIB_RULE_PERMANENT);
if (err < 0)
return err;
err = fib_default_rule_add(&fib4_rules_ops, 0x7FFE,
RT_TABLE_MAIN, 0);
if (err < 0)
return err;
err = fib_default_rule_add(&fib4_rules_ops, 0x7FFF,
RT_TABLE_DEFAULT, 0);
if (err < 0)
return err;
return 0;
}
void __init fib4_rules_init(void)
{
list_add_tail(&local_rule.common.list, &fib4_rules_ops.rules_list);
list_add_tail(&main_rule.common.list, &fib4_rules_ops.rules_list);
list_add_tail(&default_rule.common.list, &fib4_rules_ops.rules_list);
BUG_ON(fib_default_rules_init());
fib_rules_register(&fib4_rules_ops);
}

37
net/ipv6/fib6_rules.c
View File

@ -31,25 +31,6 @@ struct fib6_rule
static struct fib_rules_ops fib6_rules_ops;
static struct fib6_rule main_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0x7FFE,
.action = FR_ACT_TO_TBL,
.table = RT6_TABLE_MAIN,
},
};
static struct fib6_rule local_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0,
.action = FR_ACT_TO_TBL,
.table = RT6_TABLE_LOCAL,
.flags = FIB_RULE_PERMANENT,
},
};
struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
pol_lookup_t lookup)
{
@ -270,11 +251,23 @@ static struct fib_rules_ops fib6_rules_ops = {
.owner = THIS_MODULE,
};
static int __init fib6_default_rules_init(void)
{
int err;
err = fib_default_rule_add(&fib6_rules_ops, 0,
RT6_TABLE_LOCAL, FIB_RULE_PERMANENT);
if (err < 0)
return err;
err = fib_default_rule_add(&fib6_rules_ops, 0x7FFE, RT6_TABLE_MAIN, 0);
if (err < 0)
return err;
return 0;
}
void __init fib6_rules_init(void)
{
list_add_tail(&local_rule.common.list, &fib6_rules_ops.rules_list);
list_add_tail(&main_rule.common.list, &fib6_rules_ops.rules_list);
BUG_ON(fib6_default_rules_init());
fib_rules_register(&fib6_rules_ops);
}