On Mon, 2018-01-29 at 13:57 +0100, Greg Kroah-Hartman wrote:
4.4-stable review patch. If anyone has any objections, please let me know.
From: Mike Maloney maloney@google.com
[ Upstream commit 749439bfac6e1a2932c582e2699f91d329658196 ]
[...]
--- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1246,14 +1246,16 @@ static int ip6_setup_cork(struct sock *s v6_cork->tclass = tclass; if (rt->dst.flags & DST_XFRM_TUNNEL) mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
rt->dst.dev->mtu : dst_mtu(&rt->dst);
READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);else mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
rt->dst.dev->mtu : dst_mtu(rt->dst.path);
READ_ONCE(rt->dst.dev->mtu) : dst_mtu(rt->dst.path);if (np->frag_size < mtu) { if (np->frag_size) mtu = np->frag_size; }
- if (mtu < IPV6_MIN_MTU)
return -EINVAL;
This error path appears to leak a reference to rt->dst.
Ben.
cork->base.fragsize = mtu; if (dst_allfrag(rt->dst.path)) cork->base.flags |= IPCORK_ALLFRAG;