From: Patrick McHardy Date: Fri, 8 Feb 2008 01:56:34 +0000 (-0800) Subject: [NETFILTER]: nf_conntrack: fix ct_extend ->move operation X-Git-Tag: v2.6.25-rc1~45^2~19 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86577c661bc01d5c4e477d74567df4470d6c5138;p=linux-2.6 [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 and Thomas Woerner . Tested-by: Thomas Woerner Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h index 73b5711faf..49aac6323f 100644 --- a/include/net/netfilter/nf_conntrack_extend.h +++ b/include/net/netfilter/nf_conntrack_extend.h @@ -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; diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c index dd07362d2b..0d5fa3a54d 100644 --- a/net/ipv4/netfilter/nf_nat_core.c +++ b/net/ipv4/netfilter/nf_nat_core.c @@ -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)) diff --git a/net/netfilter/nf_conntrack_extend.c b/net/netfilter/nf_conntrack_extend.c index cf6ba6659a..8b9be1e978 100644 --- a/net/netfilter/nf_conntrack_extend.c +++ b/net/netfilter/nf_conntrack_extend.c @@ -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);