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net/af_packet: check len when min_header_len equals to 0

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commit dc633700f00f726e027846a318c5ffeb8deaaeda upstream.

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: fd1894224407 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhengchao Shao 2022-07-27 17:33:12 +08:00 • committed by Greg Kroah-Hartman
commit 25a80e7284
1 changed files with 2 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
net/packet/af_packet.c
View file

@ -2960,8 +2960,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
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;
}