packet: packet_getname_spkt: make sure string is always 0-terminated

[ Upstream commit 2dc85bf323515e59e15dfa858d1472bb25cad0fe ]

uaddr->sa_data is exactly of size 14, which is hard-coded here and
passed as a size argument to strncpy(). A device name can be of size
IFNAMSIZ (== 16), meaning we might leave the destination string
unterminated. Thus, use strlcpy() and also sizeof() while we're
at it. We need to memset the data area beforehand, since strlcpy
does not padd the remaining buffer with zeroes for user space, so
that we do not possibly leak anything.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 5a70215362a29037ac06bc0d79ecd367fc2790a4..a2ac2c37939cdfe8c208410b8421a6552dd93f45 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2820,12 +2820,11 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
                return -EOPNOTSUPP;
 
        uaddr->sa_family = AF_PACKET;
+       memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
        rcu_read_lock();
        dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
        if (dev)
-               strncpy(uaddr->sa_data, dev->name, 14);
-       else
-               memset(uaddr->sa_data, 0, 14);
+               strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
        rcu_read_unlock();
        *uaddr_len = sizeof(*uaddr);