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ipv6: fix memory leak with multiple tables during netns destruction 

fib6_net_exit only frees the main and local tables. If another table was
created with fib6_alloc_table, we leak it when the netns is destroyed.

Fix this in the same way ip_fib_net_exit cleans up tables, by walking
through the whole hashtable of fib6_table's. We can get rid of the
special cases for local and main, since they're also part of the
hashtable.

Reproducer:
    ip netns add x
    ip -net x -6 rule add from 6003:1::/64 table 100
    ip netns del x

Reported-by: Jianlin Shi <jishi@redhat.com>
Fixes: 58f09b78b7 ("[NETNS][IPV6] ip6_fib - make it per network namespace")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sabrina Dubroca 2017-09-08 10:26:19 +02:00 committed by David S. Miller
parent 126f760ca9
commit ba1cc08d94
1 changed files with 19 additions and 6 deletions
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25
net/ipv6/ip6_fib.c
View File

@ -191,6 +191,12 @@ void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
}
EXPORT_SYMBOL_GPL(rt6_free_pcpu);
static void fib6_free_table(struct fib6_table *table)
{
inetpeer_invalidate_tree(&table->tb6_peers);
kfree(table);
}
static void fib6_link_table(struct net *net, struct fib6_table *tb)
{
unsigned int h;
@ -2022,15 +2028,22 @@ static int __net_init fib6_net_init(struct net *net)
static void fib6_net_exit(struct net *net)
{
unsigned int i;
rt6_ifdown(net, NULL);
del_timer_sync(&net->ipv6.ip6_fib_timer);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
inetpeer_invalidate_tree(&net->ipv6.fib6_local_tbl->tb6_peers);
kfree(net->ipv6.fib6_local_tbl);
#endif
inetpeer_invalidate_tree(&net->ipv6.fib6_main_tbl->tb6_peers);
kfree(net->ipv6.fib6_main_tbl);
for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
struct hlist_head *head = &net->ipv6.fib_table_hash[i];
struct hlist_node *tmp;
struct fib6_table *tb;
hlist_for_each_entry_safe(tb, tmp, head, tb6_hlist) {
hlist_del(&tb->tb6_hlist);
fib6_free_table(tb);
}
}
kfree(net->ipv6.fib_table_hash);
kfree(net->ipv6.rt6_stats);
fib6_notifier_exit(net);