From d553627419145e7b5fbfec9fb5388a765a7aab5a Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sun, 10 Apr 2016 23:01:30 -0400 Subject: [PATCH] decnet: Do not build routes to devices without decnet private data. [ Upstream commit a36a0d4008488fa545c74445d69eaf56377d5d4e ] In particular, make sure we check for decnet private presence for loopback devices. Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- net/decnet/dn_route.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index 94f4ec036669..bb516bbfb1b7 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -998,10 +998,13 @@ source_ok: if (!fld.daddr) { fld.daddr = fld.saddr; - err = -EADDRNOTAVAIL; if (dev_out) dev_put(dev_out); + err = -EINVAL; dev_out = init_net.loopback_dev; + if (!dev_out->dn_ptr) + goto out; + err = -EADDRNOTAVAIL; dev_hold(dev_out); if (!fld.daddr) { fld.daddr = @@ -1074,6 +1077,8 @@ source_ok: if (dev_out == NULL) goto out; dn_db = rcu_dereference_raw(dev_out->dn_ptr); + if (!dn_db) + goto e_inval; /* Possible improvement - check all devices for local addr */ if (dn_dev_islocal(dev_out, fld.daddr)) { dev_put(dev_out); @@ -1115,6 +1120,8 @@ select_source: dev_put(dev_out); dev_out = init_net.loopback_dev; dev_hold(dev_out); + if (!dev_out->dn_ptr) + goto e_inval; fld.flowidn_oif = dev_out->ifindex; if (res.fi) dn_fib_info_put(res.fi); -- 2.39.2