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[NETFILTER]: nf_conntrack: fix ct_extend ->move operation 

The ->move operation has two bugs:

- It is called with the same extension as source and destination,
  so it doesn't update the new extension.

- The address of the old extension is calculated incorrectly,
  instead of (void *)ct->ext + ct->ext->offset[i] it uses
  ct->ext + ct->ext->offset[i].

Fixes a crash on x86_64 reported by Chuck Ebbert <cebbert@redhat.com>
and Thomas Woerner <twoerner@redhat.com>.

Tested-by: Thomas Woerner <twoerner@redhat.com>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-02-07 17:56:34 -08:00 committed by David S. Miller
parent b2155e7f70
commit 86577c661b
3 changed files with 6 additions and 5 deletions
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2
include/net/netfilter/nf_conntrack_extend.h
View File

@ -67,7 +67,7 @@ struct nf_ct_ext_type
void (*destroy)(struct nf_conn *ct);
/* Called when realloacted (can be NULL).
Contents has already been moved. */
void (*move)(struct nf_conn *ct, void *old);
void (*move)(void *new, void *old);
enum nf_ct_ext_id id;

6
net/ipv4/netfilter/nf_nat_core.c
View File

@ -600,10 +600,10 @@ static void nf_nat_cleanup_conntrack(struct nf_conn *ct)
spin_unlock_bh(&nf_nat_lock);
}
static void nf_nat_move_storage(struct nf_conn *conntrack, void *old)
static void nf_nat_move_storage(void *new, void *old)
{
struct nf_conn_nat *new_nat = nf_ct_ext_find(conntrack, NF_CT_EXT_NAT);
struct nf_conn_nat *old_nat = (struct nf_conn_nat *)old;
struct nf_conn_nat *new_nat = new;
struct nf_conn_nat *old_nat = old;
struct nf_conn *ct = old_nat->ct;
if (!ct || !(ct->status & IPS_NAT_DONE_MASK))

3
net/netfilter/nf_conntrack_extend.c
View File

@ -109,7 +109,8 @@ void *__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp)
rcu_read_lock();
t = rcu_dereference(nf_ct_ext_types[i]);
if (t && t->move)
t->move(ct, ct->ext + ct->ext->offset[i]);
t->move((void *)new + new->offset[i],
(void *)ct->ext + ct->ext->offset[i]);
rcu_read_unlock();
}
kfree(ct->ext);