ipv6: add RTA_TABLE and RTA_PREFSRC to rtm_ipv6_policy

[ Upstream commit aa8f8778493c85fff480cdf8b349b1e1dcb5f243 ]

KMSAN reported use of uninit-value that I tracked to lack
of proper size check on RTA_TABLE attribute.

I also believe RTA_PREFSRC lacks a similar check.

Fixes: 86872cb57925 ("[IPv6] route: FIB6 configuration using struct fib6_config")
Fixes: c3968a857a6b ("ipv6: RTA_PREFSRC support for ipv6 route source address selection")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 168e40d98ccee048857385d16ec51e164fe7f52f..82bf2c4ebdb287bf6f6b25c4057aea81aa1dd12a 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2333,11 +2333,13 @@ void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
 
 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
        [RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
+       [RTA_PREFSRC]           = { .len = sizeof(struct in6_addr) },
        [RTA_OIF]               = { .type = NLA_U32 },
        [RTA_IIF]               = { .type = NLA_U32 },
        [RTA_PRIORITY]          = { .type = NLA_U32 },
        [RTA_METRICS]           = { .type = NLA_NESTED },
        [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
+       [RTA_TABLE]             = { .type = NLA_U32 },
 };
 
 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,