net/ieee802154: reject zero-sized raw_sendmsg()

syzbot is hitting skb_assert_len() warning at raw_sendmsg() for ieee802154
socket. What commit dc633700f00f726e ("net/af_packet: check len when
min_header_len equals to 0") does also applies to ieee802154 socket.

Link: https://syzkaller.appspot.com/bug?extid=5ea725c25d06fb9114c4
Reported-by: syzbot <syzbot+5ea725c25d06fb9114c4@syzkaller.appspotmail.com>
Fixes: fd1894224407c484 ("bpf: Don't redirect packets with invalid pkt_len")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 7889e1ef7fad6daba421eb23919a4c6602e86b4a..cbd0e2ac4ffe9c2cc5d4ea1186a985e13013d906 100644 (file)
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -251,6 +251,9 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
                return -EOPNOTSUPP;
        }
 
+       if (!size)
+               return -EINVAL;
+
        lock_sock(sk);
        if (!sk->sk_bound_dev_if)
                dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);