From: Evgeniy Polyakov Date: Thu, 15 Nov 2007 23:52:32 +0000 (-0800) Subject: [NETFILTER]: Fix NULL pointer dereference in nf_nat_move_storage() X-Git-Tag: v2.6.24-rc3~5^2 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7799652557d966e49512479f4d3b9079bbc01fff;p=linux-2.6 [NETFILTER]: Fix NULL pointer dereference in nf_nat_move_storage() Reported by Chuck Ebbert as: https://bugzilla.redhat.com/show_bug.cgi?id=259501#c14 This routine is called each time hash should be replaced, nf_conn has extension list which contains pointers to connection tracking users (like nat, which is right now the only such user), so when replace takes place it should copy own extensions. Loop above checks for own extension, but tries to move higer-layer one, which can lead to above oops. Signed-off-by: Evgeniy Polyakov Signed-off-by: David S. Miller --- diff --git a/net/netfilter/nf_conntrack_extend.c b/net/netfilter/nf_conntrack_extend.c index a1a65a1313..cf6ba6659a 100644 --- a/net/netfilter/nf_conntrack_extend.c +++ b/net/netfilter/nf_conntrack_extend.c @@ -109,7 +109,7 @@ 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[id]); + t->move(ct, ct->ext + ct->ext->offset[i]); rcu_read_unlock(); } kfree(ct->ext);