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@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: fd1894224407 ("bpf: Don't redirect packets with invalid pkt_len")
Signed-off-by: Zhengchao Shao <shaozhengchao@xxxxxxxxxx>
---
net/packet/af_packet.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index d08c4728523b..5cbe07116e04 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3037,8 +3037,8 @@ 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;
}
--
2.17.1
