4.9-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet edumazet@google.com
[ 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 --- net/ipv6/route.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -2811,6 +2811,7 @@ void rt6_mtu_change(struct net_device *d
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 }, @@ -2820,6 +2821,7 @@ static const struct nla_policy rtm_ipv6_ [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, [RTA_ENCAP] = { .type = NLA_NESTED }, [RTA_EXPIRES] = { .type = NLA_U32 }, + [RTA_TABLE] = { .type = NLA_U32 }, };
static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,