iprule: fix segfault (FS#1875)

Fix segfault in generic_interface_cb by checking the
IPRULE_OUT/IPRULE_IN flags before doing the strcmp for the possible
configured out/in interface(s) of the ip rule.
Also don't copy the interface layer3 device as the layer 3 device is
not yet known when IFEV_CREATE event is launched.
The layer3 device will be known when the IFEV_UP event is processed in
rule_out_cb/rule_in_cb.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/iprule.c b/iprule.c
index d3f6073..27f0c89 100644
--- a/iprule.c
+++ b/iprule.c
@@ -180,15 +180,11 @@ static void generic_interface_cb(
 		if (rule_ready(rule))
 			continue;
 
-		if (!strcmp(rule->out_iface, iface->name)) {
-			memcpy(rule->out_dev, iface->l3_dev.dev->ifname, sizeof(rule->out_dev));
+		if ((rule->flags & IPRULE_OUT) && !strcmp(rule->out_iface, iface->name))
 			interface_add_user(&rule->out_iface_user, iface);
-		}
 
-		if (!strcmp(rule->in_iface, iface->name)) {
-			memcpy(rule->in_dev, iface->l3_dev.dev->ifname, sizeof(rule->in_dev));
+		if ((rule->flags & IPRULE_IN) && !strcmp(rule->in_iface, iface->name))
 			interface_add_user(&rule->in_iface_user, iface);
-		}
 	}
 }