On Wed, Jul 3, 2013 at 1:49 AM, Daniel Borkmann <dbork...@redhat.com> wrote: > The return value of nla_nest_start() is not checked, and can be NULL, > which is then being dereferenced in nla_nest_end(). Add a check to > prevent such situations. > > Signed-off-by: Daniel Borkmann <dbork...@redhat.com> > --- > On top of "net-next" tree. > > net/openvswitch/datapath.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c > index d12d6b8..51a3c66 100644 > --- a/net/openvswitch/datapath.c > +++ b/net/openvswitch/datapath.c > @@ -427,6 +427,10 @@ static int queue_userspace_packet(struct net *net, int > dp_ifindex, > upcall->dp_ifindex = dp_ifindex; > > nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); > + if (unlikely(!nla)) { > + err = -ENOMEM; > + goto out; > + }
nla_nest_start() doesn't allocate any memory, it only fails if there isn't enough space, so the correct error code would be -EMSGSIZE. However, we just calculated the correct size a few lines earlier and we don't double check the size anywhere else, so this doesn't make a lot of sense to me. X-CudaMail-Whitelist-To: dev@openvswitch.org _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev