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ipv6: explicitly initialize udp6_addr in udp_sock_create6() 

syzbot reported the use of uninitialized udp6_addr::sin6_scope_id.
We can just set ::sin6_scope_id to zero, as tunnels are unlikely
to use an IPv6 address that needs a scope id and there is no
interface to bind in this context.

For net-next, it looks different as we have cfg->bind_ifindex there
so we can probably call ipv6_iface_scope_id().

Same for ::sin6_flowinfo, tunnels don't use it.

Fixes: 8024e02879 ("udp: Add udp_sock_create for UDP tunnels to open listener socket")
Reported-by: syzbot+c56449ed3652e6720f30@syzkaller.appspotmail.com
Cc: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2018-12-18 21:17:44 -08:00 committed by David S. Miller
parent 84404d5fd5
commit fb24274546
1 changed files with 2 additions and 1 deletions
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3
net/ipv6/ip6_udp_tunnel.c
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@ -15,7 +15,7 @@
int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
struct socket **sockp)
{
struct sockaddr_in6 udp6_addr;
struct sockaddr_in6 udp6_addr = {};
int err;
struct socket *sock = NULL;
@ -42,6 +42,7 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
goto error;
if (cfg->peer_udp_port) {
memset(&udp6_addr, 0, sizeof(udp6_addr));
udp6_addr.sin6_family = AF_INET6;
memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
sizeof(udp6_addr.sin6_addr));