[PATCH 3.18 13/47] packet: validate address length

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Willem de Bruijn <will...@google.com>

[ Upstream commit 99137b7888f4058087895d035d81c6b2d31015c5 ]

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 <syzkal...@googlegroups.com>
Signed-off-by: Willem de Bruijn <will...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/packet/af_packet.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2275,6 +2275,8 @@ static int tpacket_snd(struct packet_soc
                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;
@@ -2436,6 +2438,8 @@ static int packet_snd(struct socket *soc
                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;