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net/af_packet: check len when min_header_len equals to 0
commitdc633700f0
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:fd18942244
("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>
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1 changed files with 2 additions and 2 deletions
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@ -3037,8 +3037,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
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if (err)
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goto out_free;
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if (sock->type == SOCK_RAW &&
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!dev_validate_header(dev, skb->data, len)) {
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if ((sock->type == SOCK_RAW &&
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!dev_validate_header(dev, skb->data, len)) || !skb->len) {
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err = -EINVAL;
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goto out_free;
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}
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