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net: fix percpu memory leaks

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This patch fixes following problems :

1) percpu_counter_init() can return an error, therefore
  init_frag_mem_limit() must propagate this error so that
  inet_frags_init_net() can do the same up to its callers.

2) If ip[46]_frags_ns_ctl_register() fail, we must unwind
   properly and free the percpu_counter.

Without this fix, we leave freed object in percpu_counters
global list (if CONFIG_HOTPLUG_CPU) leading to crashes.

This bug was detected by KASAN and syzkaller tool
(http://github.com/google/syzkaller)

Fixes: 6d7b857d54 ("net: use lib/percpu_counter API for fragmentation mem accounting")
Signed-off-by: Eric Dumazet <[email protected]>
Reported-by: Dmitry Vyukov <[email protected]>
Cc: Hannes Frederic Sowa <[email protected]>
Cc: Jesper Dangaard Brouer <[email protected]>
Acked-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2015-11-02 09:03:11 -08:00 • committed by David S. Miller
commit 1d6119baf0
6 changed files with 44 additions and 24 deletions
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6
net/ipv4/inet_fragment.c
View file

@ -209,12 +209,6 @@ int inet_frags_init(struct inet_frags *f)
}
EXPORT_SYMBOL(inet_frags_init);
void inet_frags_init_net(struct netns_frags *nf)
{
init_frag_mem_limit(nf);
}
EXPORT_SYMBOL(inet_frags_init_net);
void inet_frags_fini(struct inet_frags *f)
{
cancel_work_sync(&f->frags_work);

12
net/ipv4/ip_fragment.c
View file

@ -839,6 +839,8 @@ static void __init ip4_frags_ctl_register(void)
static int __net_init ipv4_frags_init_net(struct net *net)
{
int res;
/* Fragment cache limits.
*
* The fragment memory accounting code, (tries to) account for
@ -862,9 +864,13 @@ static int __net_init ipv4_frags_init_net(struct net *net)
*/
net->ipv4.frags.timeout = IP_FRAG_TIME;
inet_frags_init_net(&net->ipv4.frags);
return ip4_frags_ns_ctl_register(net);
res = inet_frags_init_net(&net->ipv4.frags);
if (res)
return res;
res = ip4_frags_ns_ctl_register(net);
if (res)
inet_frags_uninit_net(&net->ipv4.frags);
return res;
}
static void __net_exit ipv4_frags_exit_net(struct net *net)