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authorWillem de Bruijn <willemb@google.com>2018-12-21 12:06:59 -0500
committerDavid S. Miller <davem@davemloft.net>2018-12-21 09:11:25 -0800
commit99137b7888f4058087895d035d81c6b2d31015c5 (patch)
tree1ceba39b8276cb77f2ce7ec7369bd96c6a31d21f /net/packet
parentd134e486e831defd26130770181f01dfc6195f7d (diff)
downloadlinux-stericsson-99137b7888f4058087895d035d81c6b2d31015c5.tar.gz
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>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c4
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;