A recent commit had an unintended side effect with reject routes:
rt6i_pcpu is expected to always be initialized for all fib6_info except
the null entry. The commit mentioned below skips it for reject routes
and ends up leaking references to the loopback device. For example,
ip netns add foo
ip -netns foo li set lo up
ip -netns foo -6 ro add blackhole 2001:db8:1::1
ip netns exec foo ping6 2001:db8:1::1
ip netns del foo
ends up spewing:
unregister_netdevice: waiting for lo to become free. Usage count = 3
The fib_nh_common_init is not needed for reject routes (no ipv4 caching
or encaps), so move the alloc_percpu_gfp after it and adjust the goto label.
Fixes:
f40b6ae2b612 ("ipv6: Move pcpu cached routes to fib6_nh")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
goto out;
}
}
- goto set_dev;
+ goto pcpu_alloc;
}
if (cfg->fc_flags & RTF_GATEWAY) {
!netif_carrier_ok(dev))
fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
+ err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
+ cfg->fc_encap_type, cfg, gfp_flags, extack);
+ if (err)
+ goto out;
+
+pcpu_alloc:
fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
if (!fib6_nh->rt6i_pcpu) {
err = -ENOMEM;
goto out;
}
- err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
- cfg->fc_encap_type, cfg, gfp_flags, extack);
- if (err)
- goto out;
-set_dev:
fib6_nh->fib_nh_dev = dev;
fib6_nh->fib_nh_oif = dev->ifindex;
err = 0;