Merge tag 'batadv-net-for-davem-20190821' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
Here is a batman-adv bugfix:

 - fix uninit-value in batadv_netlink_get_ifindex(), by Eric Dumazet
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/batman-adv/netlink.c

@@ -164,7 +164,7 @@ batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
 {
 	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
 
-	return attr ? nla_get_u32(attr) : 0;
+	return (attr && nla_len(attr) == sizeof(u32)) ? nla_get_u32(attr) : 0;
 }
 
 /**