User can use AF_PACKET socket to send packets with the length of 0.
When min_header_len equals to 0, packet_snd will call __dev_queue_xmit
to send packets, and sock->type can be any type.
Reported-by: syzbot+5ea725c25d06fb9114c4@syzkaller.appspotmail.com
Fixes: fe1f468a3ebc ("bpf: Don't redirect packets with invalid pkt_len")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
if (err)
goto out_free;
- if (sock->type == SOCK_RAW &&
- !dev_validate_header(dev, skb->data, len)) {
+ if ((sock->type == SOCK_RAW &&
+ !dev_validate_header(dev, skb->data, len)) || !skb->len) {
err = -EINVAL;
goto out_free;
}