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| author | Willem de Bruijn <willemb@google.com> | 2018-12-21 12:06:59 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-21 09:11:25 -0800 |
| commit | 99137b7888f4058087895d035d81c6b2d31015c5 (patch) | |
| tree | 1ceba39b8276cb77f2ce7ec7369bd96c6a31d21f | |
| parent | d134e486e831defd26130770181f01dfc6195f7d (diff) | |
| download | linux-stable-99137b7888f4058087895d035d81c6b2d31015c5.tar.gz linux-stable-99137b7888f4058087895d035d81c6b2d31015c5.tar.bz2 linux-stable-99137b7888f4058087895d035d81c6b2d31015c5.zip | |
packet: validate address length
Packet sockets with SOCK_DGRAM may pass an address for use in
dev_hard_header. Ensure that it is of sufficient length.
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/packet/af_packet.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 6655793765b2..5dda263b4a0a 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2627,6 +2627,8 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) proto = saddr->sll_protocol; addr = saddr->sll_addr; dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); + if (addr && dev && saddr->sll_halen < dev->addr_len) + goto out; } err = -ENXIO; @@ -2825,6 +2827,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) proto = saddr->sll_protocol; addr = saddr->sll_addr; dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); + if (addr && dev && saddr->sll_halen < dev->addr_len) + goto out; } err = -ENXIO; |