4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alexander Potapenko glider@google.com
[ Upstream commit 7880287981b60a6808f39f297bb66936e8bdf57a ]
KMSAN reports use of uninitialized memory in the case when |alen| is smaller than sizeof(struct sockaddr_nl), and therefore |nladdr| isn't fully copied from the userspace.
Signed-off-by: Alexander Potapenko glider@google.com Fixes: 1da177e4c3f41524 ("Linux-2.6.12-rc2") Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netlink/af_netlink.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1054,6 +1054,9 @@ static int netlink_connect(struct socket if (addr->sa_family != AF_NETLINK) return -EINVAL;
+ if (alen < sizeof(struct sockaddr_nl)) + return -EINVAL; + if ((nladdr->nl_groups || nladdr->nl_pid) && !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) return -EPERM;