net: Fix IP_MULTICAST_IF

ipv4/ipv6 setsockopt(IP_MULTICAST_IF) have dubious __dev_get_by_index() calls.

This function should be called only with RTNL or dev_base_lock held, or reader
could see a corrupt hash chain and eventually enter an endless loop.

Fix is to call dev_get_by_index()/dev_put().

If this happens to be performance critical, we could define a new dev_exist_by_index()
function to avoid touching dev refcount.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 14f54eb5a7fc..4f7aaf6996a3 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -496,13 +496,17 @@ done:
                         goto e_inval;
 
                 if (val) {
+                        struct net_device *dev;
+
                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
                                 goto e_inval;
 
-                        if (__dev_get_by_index(net, val) == NULL) {
+                        dev = dev_get_by_index(net, val);
+                        if (!dev) {
                                 retv = -ENODEV;
                                 break;
                         }
+                        dev_put(dev);
                 }
                 np->mcast_oif = val;
                 retv = 0;