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net: rtnetlink: address is mandatory for rtnl_fdb_get 

We must have an address to lookup otherwise we'll derefence a null
pointer in the ndo_fdb_get callbacks.

CC: Roopa Prabhu <roopa@cumulusnetworks.com>
CC: David Ahern <dsa@cumulusnetworks.com>
Reported-by: syzbot+017b1f61c82a1c3e7efd@syzkaller.appspotmail.com
Fixes: 5b2f94b276 ("net: rtnetlink: support for fdb get")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2018-12-30 14:33:20 +02:00 committed by David S. Miller
parent f7d18ef6a9
commit f989d03ef2
1 changed files with 5 additions and 0 deletions
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5
net/core/rtnetlink.c
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@ -4104,6 +4104,11 @@ static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
if (err < 0)
return err;
if (!addr) {
NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
return -EINVAL;
}
if (brport_idx) {
dev = __dev_get_by_index(net, brport_idx);
if (!dev) {