tipc: info leak in __tipc_nl_add_udp_addr()

We should clear out the padding and unused struct members so that we
don't expose stack information to userspace.

Fixes: fdb3accc2c15 ('tipc: add the ability to get UDP options via netlink')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index d80cd3f7503f26b9fc3f6171c125152ac332115b..78cab9c5a445afd5a57a9b53d6960da533a12ea0 100644 (file)
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -407,6 +407,7 @@ static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
        if (ntohs(addr->proto) == ETH_P_IP) {
                struct sockaddr_in ip4;
 
+               memset(&ip4, 0, sizeof(ip4));
                ip4.sin_family = AF_INET;
                ip4.sin_port = addr->port;
                ip4.sin_addr.s_addr = addr->ipv4.s_addr;
@@ -417,6 +418,7 @@ static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
        } else if (ntohs(addr->proto) == ETH_P_IPV6) {
                struct sockaddr_in6 ip6;
 
+               memset(&ip6, 0, sizeof(ip6));
                ip6.sin6_family = AF_INET6;
                ip6.sin6_port  = addr->port;
                memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));