[PATCH] net/vxlan: fix potential null pointer deference

[Young Xiao]

There is a possible null pointer deference bug in vxlan_fdb_info(),
which is similar to the bug which was fixed in commit 6adc5fd6a142
("net/neighbour: fix crash at dumping device-agnostic proxy entries").

Signed-off-by: Young Xiao <92siuy...@gmail.com>
---
 drivers/net/vxlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 5994d54..1ba5977 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -274,7 +274,7 @@ static int vxlan_fdb_info(struct sk_buff *skb, struct 
vxlan_dev *vxlan,
        } else
                ndm->ndm_family = AF_BRIDGE;
        ndm->ndm_state = fdb->state;
-       ndm->ndm_ifindex = vxlan->dev->ifindex;
+       ndm->ndm_ifindex = vxlan->dev ? vxlan->dev->ifindex : 0;
        ndm->ndm_flags = fdb->flags;
        if (rdst->offloaded)
                ndm->ndm_flags |= NTF_OFFLOADED;
-- 
2.7.4