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authorZhengchao Shao <shaozhengchao@huawei.com>2022-07-27 17:33:12 +0800
committerDavid S. Miller <davem@davemloft.net>2022-07-29 12:09:27 +0100
commitdc633700f00f726e027846a318c5ffeb8deaaeda (patch)
tree0f16fddf941cf27b94cc5ba489441b3beef10826 /net
parent3b1c31474cb934be352a8d75389bfe04773799c6 (diff)
net/af_packet: check len when min_header_len equals to 0
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>
Diffstat (limited to 'net')
-rw-r--r--net/packet/af_packet.c4
1 files 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;
}