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Commit 03ac583e authored by Tetsuo Handa's avatar Tetsuo Handa Committed by Greg Kroah-Hartman
Browse files

net/ieee802154: reject zero-sized raw_sendmsg() 

[ Upstream commit 3a4d061c699bd3eedc80dc97a4b2a2e1af83c6f5 ]

syzbot is hitting skb_assert_len() warning at raw_sendmsg() for ieee802154
socket. What commit dc633700f00f726e ("net/af_packet: check len when
min_header_len equals to 0") does also applies to ieee802154 socket.

Link: https://syzkaller.appspot.com/bug?extid=5ea725c25d06fb9114c4


Reported-by: default avatarsyzbot <syzbot+5ea725c25d06fb9114c4@syzkaller.appspotmail.com>
Fixes: fd1894224407c484 ("bpf: Don't redirect packets with invalid pkt_len")
Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 71e0ab5b

net/ieee802154/socket.c

+3 −0
Original line number Diff line number Diff line
@@ -252,6 +252,9 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) 
		return -EOPNOTSUPP;

	}



	if (!size)

		return -EINVAL;



	lock_sock(sk);

	if (!sk->sk_bound_dev_if)

		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);